diff --git a/README.md b/README.md
index cf0691c..d6bb136 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,13 @@
 # Simple Todo App with FastAPI and SQLite
 
-A simple Todo API application built with FastAPI and SQLite that provides CRUD operations for todo items.
+A simple Todo API application built with FastAPI and SQLite that provides CRUD operations for todo items with user authentication.
 
 ## Features
 
 - Create, read, update, and delete todo items
+- User authentication with JWT tokens
+- User registration and login
+- Secure password hashing with bcrypt
 - RESTful API with FastAPI
 - SQLite database with SQLAlchemy ORM
 - Database migrations with Alembic
@@ -19,19 +22,26 @@ simpletodoapp/
 ├── migrations/                 # Database migration scripts
 ├── app/                        # Application package
 │   ├── api/                    # API routes
+│   │   ├── deps.py             # Dependency injection and auth
 │   │   └── routes/             # Route modules 
+│   │       ├── auth.py         # Authentication endpoints
 │   │       ├── health.py       # Health check endpoint
 │   │       └── todos.py        # Todo endpoints
 │   ├── core/                   # Core modules
-│   │   └── config.py           # App configuration
+│   │   ├── config.py           # App configuration
+│   │   └── security.py         # Security utilities
 │   ├── crud/                   # CRUD operations
-│   │   └── todo.py             # Todo CRUD operations
+│   │   ├── todo.py             # Todo CRUD operations
+│   │   └── user.py             # User CRUD operations
 │   ├── db/                     # Database setup
 │   │   └── session.py          # DB session and engine
 │   ├── models/                 # SQLAlchemy models
-│   │   └── todo.py             # Todo model
+│   │   ├── todo.py             # Todo model
+│   │   └── user.py             # User model
 │   └── schemas/                # Pydantic schemas
-│       └── todo.py             # Todo schemas
+│       ├── todo.py             # Todo schemas
+│       ├── user.py             # User schemas
+│       └── token.py            # Token schemas
 ├── main.py                     # FastAPI application creation
 └── requirements.txt            # Python dependencies
 ```
@@ -56,7 +66,12 @@ cd simpletodoapp
 pip install -r requirements.txt
 ```
 
-3. Run the application:
+3. Apply the database migrations:
+```bash
+alembic upgrade head
+```
+
+4. Run the application:
 ```bash
 uvicorn main:app --reload
 ```
@@ -74,9 +89,14 @@ After starting the application, you can access the API documentation at:
 ### Health Check
 - `GET /health` - Check the health of the application and database connection
 
-### Todo Operations
-- `GET /api/v1/todos` - Retrieve all todos (with pagination)
-- `POST /api/v1/todos` - Create a new todo
+### Authentication
+- `POST /api/v1/auth/register` - Register a new user
+- `POST /api/v1/auth/login` - Login and get access token
+- `GET /api/v1/auth/me` - Get current user information
+
+### Todo Operations (Requires Authentication)
+- `GET /api/v1/todos` - Retrieve all todos for current user (with pagination)
+- `POST /api/v1/todos` - Create a new todo for current user
 - `GET /api/v1/todos/{todo_id}` - Retrieve a specific todo
 - `PUT /api/v1/todos/{todo_id}` - Update a specific todo
 - `DELETE /api/v1/todos/{todo_id}` - Delete a specific todo
diff --git a/app/api/deps.py b/app/api/deps.py
new file mode 100644
index 0000000..223dba6
--- /dev/null
+++ b/app/api/deps.py
@@ -0,0 +1,57 @@
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from jose import JWTError, jwt
+from pydantic import ValidationError
+from sqlalchemy.orm import Session
+
+from app import crud, models, schemas
+from app.core import security
+from app.core.config import settings
+from app.db.session import get_db
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl=f"{settings.API_V1_STR}/auth/login")
+
+
+def get_current_user(
+    db: Session = Depends(get_db), token: str = Depends(oauth2_scheme)
+) -> models.User:
+    """
+    Validate access token and return current user
+    """
+    try:
+        payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[security.ALGORITHM])
+        token_data = schemas.TokenPayload(**payload)
+    except (JWTError, ValidationError) as e:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Could not validate credentials",
+        ) from e
+
+    user = crud.user.get(db, id=token_data.sub)
+    if not user:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="User not found")
+    return user
+
+
+def get_current_active_user(
+    current_user: models.User = Depends(get_current_user),
+) -> models.User:
+    """
+    Check if current user is active
+    """
+    if not current_user.is_active:
+        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Inactive user")
+    return current_user
+
+
+def get_current_active_superuser(
+    current_user: models.User = Depends(get_current_user),
+) -> models.User:
+    """
+    Check if current user is a superuser
+    """
+    if not current_user.is_superuser:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN, detail="The user doesn't have enough privileges"
+        )
+    return current_user
diff --git a/app/api/routes/auth.py b/app/api/routes/auth.py
new file mode 100644
index 0000000..95fce89
--- /dev/null
+++ b/app/api/routes/auth.py
@@ -0,0 +1,77 @@
+from datetime import timedelta
+from typing import Any
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordRequestForm
+from sqlalchemy.orm import Session
+
+from app import crud, models, schemas
+from app.api import deps
+from app.core import security
+from app.core.config import settings
+
+router = APIRouter(prefix="/auth", tags=["auth"])
+
+
+@router.post("/register", response_model=schemas.User)
+def register(
+    *,
+    db: Session = Depends(deps.get_db),
+    user_in: schemas.UserCreate,
+) -> Any:
+    """
+    Register a new user
+    """
+    # Check if user with same email exists
+    user = crud.user.get_by_email(db, email=user_in.email)
+    if user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="A user with this email already exists",
+        )
+
+    # Check if user with same username exists
+    user = crud.user.get_by_username(db, username=user_in.username)
+    if user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="A user with this username already exists",
+        )
+
+    # Create the user
+    user = crud.user.create(db, obj_in=user_in)
+    return user
+
+
+@router.post("/login", response_model=schemas.Token)
+def login_access_token(
+    db: Session = Depends(deps.get_db),
+    form_data: OAuth2PasswordRequestForm = Depends(),
+) -> Any:
+    """
+    OAuth2 compatible token login, get an access token for future requests
+    """
+    user = crud.user.authenticate(db, email=form_data.username, password=form_data.password)
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect email or password",
+        )
+    if not crud.user.is_active(user):
+        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Inactive user")
+
+    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+    return {
+        "access_token": security.create_access_token(user.id, expires_delta=access_token_expires),
+        "token_type": "bearer",
+    }
+
+
+@router.get("/me", response_model=schemas.User)
+def read_users_me(
+    current_user: models.User = Depends(deps.get_current_active_user),
+) -> Any:
+    """
+    Get current user
+    """
+    return current_user
diff --git a/app/api/routes/todos.py b/app/api/routes/todos.py
index a521345..f50830f 100644
--- a/app/api/routes/todos.py
+++ b/app/api/routes/todos.py
@@ -3,7 +3,8 @@ from typing import List
 from fastapi import APIRouter, Depends, HTTPException, Query, status
 from sqlalchemy.orm import Session
 
-from app import crud
+from app import crud, models
+from app.api import deps
 from app.db.session import get_db
 from app.schemas.todo import Todo, TodoCreate, TodoUpdate
 
@@ -15,55 +16,76 @@ def get_todos(
     skip: int = Query(0, description="Skip the first N items"),
     limit: int = Query(100, description="Limit the number of items returned"),
     db: Session = Depends(get_db),
+    current_user: models.User = Depends(deps.get_current_active_user),
 ):
     """
-    Get all todos with pagination
+    Get all todos for the current user with pagination
     """
-    return crud.todo.get_todos(db=db, skip=skip, limit=limit)
+    return crud.todo.get_todos(db=db, user_id=current_user.id, skip=skip, limit=limit)
 
 
 @router.post("/", response_model=Todo, status_code=status.HTTP_201_CREATED)
-def create_todo(todo: TodoCreate, db: Session = Depends(get_db)):
+def create_todo(
+    todo: TodoCreate,
+    db: Session = Depends(get_db),
+    current_user: models.User = Depends(deps.get_current_active_user),
+):
     """
-    Create a new todo
+    Create a new todo for the current user
     """
-    return crud.todo.create_todo(db=db, todo=todo)
+    return crud.todo.create_todo(db=db, todo=todo, user_id=current_user.id)
 
 
 @router.get("/{todo_id}", response_model=Todo)
-def get_todo(todo_id: int, db: Session = Depends(get_db)):
+def get_todo(
+    todo_id: int,
+    db: Session = Depends(get_db),
+    current_user: models.User = Depends(deps.get_current_active_user),
+):
     """
-    Get a specific todo by ID
+    Get a specific todo by ID, ensuring it belongs to the current user
     """
-    db_todo = crud.todo.get_todo(db=db, todo_id=todo_id)
+    db_todo = crud.todo.get_todo(db=db, todo_id=todo_id, user_id=current_user.id)
     if db_todo is None:
         raise HTTPException(
-            status_code=status.HTTP_404_NOT_FOUND, detail=f"Todo with ID {todo_id} not found"
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail=f"Todo with ID {todo_id} not found",
         )
     return db_todo
 
 
 @router.put("/{todo_id}", response_model=Todo)
-def update_todo(todo_id: int, todo: TodoUpdate, db: Session = Depends(get_db)):
+def update_todo(
+    todo_id: int,
+    todo: TodoUpdate,
+    db: Session = Depends(get_db),
+    current_user: models.User = Depends(deps.get_current_active_user),
+):
     """
-    Update a todo
+    Update a todo, ensuring it belongs to the current user
     """
-    db_todo = crud.todo.update_todo(db=db, todo_id=todo_id, todo=todo)
+    db_todo = crud.todo.update_todo(db=db, todo_id=todo_id, todo=todo, user_id=current_user.id)
     if db_todo is None:
         raise HTTPException(
-            status_code=status.HTTP_404_NOT_FOUND, detail=f"Todo with ID {todo_id} not found"
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail=f"Todo with ID {todo_id} not found",
         )
     return db_todo
 
 
 @router.delete("/{todo_id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
-def delete_todo(todo_id: int, db: Session = Depends(get_db)):
+def delete_todo(
+    todo_id: int,
+    db: Session = Depends(get_db),
+    current_user: models.User = Depends(deps.get_current_active_user),
+):
     """
-    Delete a todo
+    Delete a todo, ensuring it belongs to the current user
     """
-    success = crud.todo.delete_todo(db=db, todo_id=todo_id)
+    success = crud.todo.delete_todo(db=db, todo_id=todo_id, user_id=current_user.id)
     if not success:
         raise HTTPException(
-            status_code=status.HTTP_404_NOT_FOUND, detail=f"Todo with ID {todo_id} not found"
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail=f"Todo with ID {todo_id} not found",
         )
     return None
diff --git a/app/core/config.py b/app/core/config.py
index 0bda318..7b26174 100644
--- a/app/core/config.py
+++ b/app/core/config.py
@@ -1,3 +1,4 @@
+import secrets
 from typing import List, Union
 
 from pydantic import AnyHttpUrl, validator
@@ -8,6 +9,10 @@ class Settings(BaseSettings):
     API_V1_STR: str = "/api/v1"
     PROJECT_NAME: str = "SimpleTodoApp"
 
+    # Security
+    SECRET_KEY: str = secrets.token_urlsafe(32)
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 60 * 24 * 8  # 8 days
+
     # CORS
     BACKEND_CORS_ORIGINS: List[AnyHttpUrl] = []
 
diff --git a/app/core/security.py b/app/core/security.py
new file mode 100644
index 0000000..20f15b8
--- /dev/null
+++ b/app/core/security.py
@@ -0,0 +1,39 @@
+from datetime import datetime, timedelta
+from typing import Any, Optional, Union
+
+from jose import jwt
+from passlib.context import CryptContext
+
+from app.core.config import settings
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+ALGORITHM = "HS256"
+
+
+def create_access_token(subject: Union[str, Any], expires_delta: Optional[timedelta] = None) -> str:
+    """
+    Creates a JWT token using the subject (typically user ID) and expiration time
+    """
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+
+    to_encode = {"exp": expire, "sub": str(subject)}
+    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=ALGORITHM)
+    return encoded_jwt
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    """
+    Verifies a plain password against a hashed password
+    """
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def get_password_hash(password: str) -> str:
+    """
+    Creates a hash from a plain password
+    """
+    return pwd_context.hash(password)
diff --git a/app/crud/__init__.py b/app/crud/__init__.py
index e69de29..e57cbf4 100644
--- a/app/crud/__init__.py
+++ b/app/crud/__init__.py
@@ -0,0 +1,8 @@
+from app.crud import user  # noqa: F401
+from app.crud.todo import (  # noqa: F401
+    create_todo,
+    delete_todo,
+    get_todo,
+    get_todos,
+    update_todo,
+)
diff --git a/app/crud/todo.py b/app/crud/todo.py
index e989a9a..603ca9b 100644
--- a/app/crud/todo.py
+++ b/app/crud/todo.py
@@ -6,36 +6,44 @@ from app.models.todo import Todo
 from app.schemas.todo import TodoCreate, TodoUpdate
 
 
-def get_todos(db: Session, skip: int = 0, limit: int = 100) -> List[Todo]:
+def get_todos(db: Session, user_id: int, skip: int = 0, limit: int = 100) -> List[Todo]:
     """
-    Get all todo items with pagination
+    Get all todo items for a specific user with pagination
     """
-    return db.query(Todo).offset(skip).limit(limit).all()
+    return db.query(Todo).filter(Todo.owner_id == user_id).offset(skip).limit(limit).all()
 
 
-def get_todo(db: Session, todo_id: int) -> Optional[Todo]:
+def get_todo(db: Session, todo_id: int, user_id: int = None) -> Optional[Todo]:
     """
-    Get a specific todo item by ID
+    Get a specific todo item by ID, optionally filtering by user_id
     """
-    return db.query(Todo).filter(Todo.id == todo_id).first()
+    query = db.query(Todo).filter(Todo.id == todo_id)
+    if user_id is not None:
+        query = query.filter(Todo.owner_id == user_id)
+    return query.first()
 
 
-def create_todo(db: Session, todo: TodoCreate) -> Todo:
+def create_todo(db: Session, todo: TodoCreate, user_id: int) -> Todo:
     """
     Create a new todo item
     """
-    db_todo = Todo(title=todo.title, description=todo.description, completed=todo.completed)
+    db_todo = Todo(
+        title=todo.title,
+        description=todo.description,
+        completed=todo.completed,
+        owner_id=user_id,
+    )
     db.add(db_todo)
     db.commit()
     db.refresh(db_todo)
     return db_todo
 
 
-def update_todo(db: Session, todo_id: int, todo: TodoUpdate) -> Optional[Todo]:
+def update_todo(db: Session, todo_id: int, todo: TodoUpdate, user_id: int = None) -> Optional[Todo]:
     """
-    Update a todo item
+    Update a todo item, optionally checking owner
     """
-    db_todo = get_todo(db, todo_id)
+    db_todo = get_todo(db, todo_id, user_id)
     if not db_todo:
         return None
 
@@ -49,11 +57,11 @@ def update_todo(db: Session, todo_id: int, todo: TodoUpdate) -> Optional[Todo]:
     return db_todo
 
 
-def delete_todo(db: Session, todo_id: int) -> bool:
+def delete_todo(db: Session, todo_id: int, user_id: int = None) -> bool:
     """
-    Delete a todo item
+    Delete a todo item, optionally checking owner
     """
-    db_todo = get_todo(db, todo_id)
+    db_todo = get_todo(db, todo_id, user_id)
     if not db_todo:
         return False
 
diff --git a/app/crud/user.py b/app/crud/user.py
new file mode 100644
index 0000000..1a83577
--- /dev/null
+++ b/app/crud/user.py
@@ -0,0 +1,94 @@
+from typing import Any, Dict, Optional, Union
+
+from sqlalchemy.orm import Session
+
+from app.core.security import get_password_hash, verify_password
+from app.models.user import User
+from app.schemas.user import UserCreate, UserUpdate
+
+
+def get(db: Session, id: int) -> Optional[User]:
+    """
+    Get a user by ID
+    """
+    return db.query(User).filter(User.id == id).first()
+
+
+def get_by_email(db: Session, email: str) -> Optional[User]:
+    """
+    Get a user by email
+    """
+    return db.query(User).filter(User.email == email).first()
+
+
+def get_by_username(db: Session, username: str) -> Optional[User]:
+    """
+    Get a user by username
+    """
+    return db.query(User).filter(User.username == username).first()
+
+
+def create(db: Session, *, obj_in: UserCreate) -> User:
+    """
+    Create a new user
+    """
+    db_obj = User(
+        email=obj_in.email,
+        username=obj_in.username,
+        hashed_password=get_password_hash(obj_in.password),
+        is_active=obj_in.is_active,
+        is_superuser=obj_in.is_superuser,
+    )
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+
+def update(db: Session, *, db_obj: User, obj_in: Union[UserUpdate, Dict[str, Any]]) -> User:
+    """
+    Update a user
+    """
+    if isinstance(obj_in, dict):
+        update_data = obj_in
+    else:
+        update_data = obj_in.model_dump(exclude_unset=True)
+
+    if update_data.get("password"):
+        hashed_password = get_password_hash(update_data["password"])
+        del update_data["password"]
+        update_data["hashed_password"] = hashed_password
+
+    for field, value in update_data.items():
+        setattr(db_obj, field, value)
+
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+
+def authenticate(db: Session, *, email: str, password: str) -> Optional[User]:
+    """
+    Authenticate a user
+    """
+    user = get_by_email(db, email=email)
+    if not user:
+        return None
+    if not verify_password(password, user.hashed_password):
+        return None
+    return user
+
+
+def is_active(user: User) -> bool:
+    """
+    Check if user is active
+    """
+    return user.is_active
+
+
+def is_superuser(user: User) -> bool:
+    """
+    Check if user is superuser
+    """
+    return user.is_superuser
diff --git a/app/models/__init__.py b/app/models/__init__.py
index e69de29..0e80c84 100644
--- a/app/models/__init__.py
+++ b/app/models/__init__.py
@@ -0,0 +1,2 @@
+from app.models.todo import Todo  # noqa: F401
+from app.models.user import User  # noqa: F401
diff --git a/app/models/todo.py b/app/models/todo.py
index 20b2a6b..aa32c1c 100644
--- a/app/models/todo.py
+++ b/app/models/todo.py
@@ -1,4 +1,5 @@
-from sqlalchemy import Boolean, Column, DateTime, Integer, String
+from sqlalchemy import Boolean, Column, DateTime, ForeignKey, Integer, String
+from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
 
 from app.db.session import Base
@@ -13,5 +14,9 @@ class Todo(Base):
     title = Column(String, index=True)
     description = Column(String, nullable=True)
     completed = Column(Boolean, default=False)
+    owner_id = Column(Integer, ForeignKey("users.id"), nullable=False)
     created_at = Column(DateTime(timezone=True), default=func.now())
     updated_at = Column(DateTime(timezone=True), default=func.now(), onupdate=func.now())
+
+    # Relationships
+    owner = relationship("User", back_populates="todos")
diff --git a/app/models/user.py b/app/models/user.py
new file mode 100644
index 0000000..0c8cd91
--- /dev/null
+++ b/app/models/user.py
@@ -0,0 +1,23 @@
+from sqlalchemy import Boolean, Column, DateTime, Integer, String
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+
+from app.db.session import Base
+
+
+class User(Base):
+    """Database model for User accounts"""
+
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    email = Column(String, unique=True, index=True, nullable=False)
+    username = Column(String, unique=True, index=True, nullable=False)
+    hashed_password = Column(String, nullable=False)
+    is_active = Column(Boolean, default=True)
+    is_superuser = Column(Boolean, default=False)
+    created_at = Column(DateTime(timezone=True), default=func.now())
+    updated_at = Column(DateTime(timezone=True), default=func.now(), onupdate=func.now())
+
+    # Relationships
+    todos = relationship("Todo", back_populates="owner", cascade="all, delete-orphan")
diff --git a/app/schemas/__init__.py b/app/schemas/__init__.py
index e69de29..17c74a5 100644
--- a/app/schemas/__init__.py
+++ b/app/schemas/__init__.py
@@ -0,0 +1,3 @@
+from app.schemas.todo import Todo, TodoCreate, TodoUpdate  # noqa: F401
+from app.schemas.token import Token, TokenPayload  # noqa: F401
+from app.schemas.user import User, UserCreate, UserInDB, UserUpdate  # noqa: F401
diff --git a/app/schemas/todo.py b/app/schemas/todo.py
index 1f3f116..4e75a93 100644
--- a/app/schemas/todo.py
+++ b/app/schemas/todo.py
@@ -15,7 +15,7 @@ class TodoBase(BaseModel):
 class TodoCreate(TodoBase):
     """Schema for creating a new Todo item"""
 
-    pass
+    # No need to include owner_id here as it will be set from the current user
 
 
 class TodoUpdate(BaseModel):
@@ -30,6 +30,7 @@ class TodoInDBBase(TodoBase):
     """Base schema for Todo items from the database"""
 
     id: int
+    owner_id: int
     created_at: datetime
     updated_at: datetime
 
diff --git a/app/schemas/token.py b/app/schemas/token.py
new file mode 100644
index 0000000..7f079d6
--- /dev/null
+++ b/app/schemas/token.py
@@ -0,0 +1,16 @@
+from typing import Optional
+
+from pydantic import BaseModel
+
+
+class Token(BaseModel):
+    """Schema for token response"""
+
+    access_token: str
+    token_type: str
+
+
+class TokenPayload(BaseModel):
+    """Schema for token payload"""
+
+    sub: Optional[int] = None
diff --git a/app/schemas/user.py b/app/schemas/user.py
new file mode 100644
index 0000000..df6c92a
--- /dev/null
+++ b/app/schemas/user.py
@@ -0,0 +1,59 @@
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel, EmailStr, Field, field_validator
+
+
+class UserBase(BaseModel):
+    """Base schema for User objects"""
+
+    email: EmailStr
+    username: str = Field(..., min_length=3, max_length=50)
+    is_active: bool = True
+    is_superuser: bool = False
+
+
+class UserCreate(UserBase):
+    """Schema for creating a new user"""
+
+    password: str = Field(..., min_length=8, max_length=100)
+    password_confirm: str
+
+    @field_validator("password_confirm")
+    def passwords_match(cls, v, values):
+        if "password" in values.data and v != values.data["password"]:
+            raise ValueError("Passwords do not match")
+        return v
+
+
+class UserUpdate(BaseModel):
+    """Schema for updating a user"""
+
+    email: Optional[EmailStr] = None
+    username: Optional[str] = None
+    password: Optional[str] = None
+    is_active: Optional[bool] = None
+    is_superuser: Optional[bool] = None
+
+
+class UserInDBBase(UserBase):
+    """Base schema for User objects from the database"""
+
+    id: int
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class User(UserInDBBase):
+    """Schema for User objects returned from the API"""
+
+    pass
+
+
+class UserInDB(UserInDBBase):
+    """Schema for User objects with hashed_password"""
+
+    hashed_password: str
diff --git a/main.py b/main.py
index 2f1c9f4..0cb08ee 100644
--- a/main.py
+++ b/main.py
@@ -1,7 +1,7 @@
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
-from app.api.routes import health, todos
+from app.api.routes import auth, health, todos
 from app.core.config import settings
 
 app = FastAPI(
@@ -22,6 +22,7 @@ if settings.BACKEND_CORS_ORIGINS:
     )
 
 # Include routers
+app.include_router(auth.router, prefix=settings.API_V1_STR)
 app.include_router(todos.router, prefix=settings.API_V1_STR)
 app.include_router(health.router)
 
diff --git a/migrations/versions/0002_add_users_table.py b/migrations/versions/0002_add_users_table.py
new file mode 100644
index 0000000..a471ab2
--- /dev/null
+++ b/migrations/versions/0002_add_users_table.py
@@ -0,0 +1,62 @@
+"""add users table and update todos table
+
+Revision ID: 0002
+Revises: 0001
+Create Date: 2023-11-10
+
+"""
+
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "0002"
+down_revision = "0001"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # Create users table
+    op.create_table(
+        "users",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("email", sa.String(), nullable=False),
+        sa.Column("username", sa.String(), nullable=False),
+        sa.Column("hashed_password", sa.String(), nullable=False),
+        sa.Column("is_active", sa.Boolean(), nullable=False, default=True),
+        sa.Column("is_superuser", sa.Boolean(), nullable=False, default=False),
+        sa.Column(
+            "created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()
+        ),
+        sa.Column(
+            "updated_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()
+        ),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index(op.f("ix_users_id"), "users", ["id"], unique=False)
+    op.create_index(op.f("ix_users_email"), "users", ["email"], unique=True)
+    op.create_index(op.f("ix_users_username"), "users", ["username"], unique=True)
+
+    # Add owner_id column to todos table
+    with op.batch_alter_table("todos") as batch_op:
+        # First, create a default user to associate with existing todos
+        # For SQLite, we need to handle this differently
+        batch_op.add_column(sa.Column("owner_id", sa.Integer(), nullable=True))
+
+    # Create a foreign key constraint separately
+    with op.batch_alter_table("todos") as batch_op:
+        batch_op.create_foreign_key("fk_todos_owner_id_users", "users", ["owner_id"], ["id"])
+
+
+def downgrade() -> None:
+    # Remove foreign key and owner_id column from todos table
+    with op.batch_alter_table("todos") as batch_op:
+        batch_op.drop_constraint("fk_todos_owner_id_users", type_="foreignkey")
+        batch_op.drop_column("owner_id")
+
+    # Drop users table
+    op.drop_index(op.f("ix_users_username"), table_name="users")
+    op.drop_index(op.f("ix_users_email"), table_name="users")
+    op.drop_index(op.f("ix_users_id"), table_name="users")
+    op.drop_table("users")
diff --git a/requirements.txt b/requirements.txt
index 7cfc345..526dd54 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,4 +7,7 @@ pydantic-settings>=2.0.3
 python-multipart>=0.0.6
 ruff>=0.1.3
 pytest>=7.4.3
-httpx>=0.25.1
\ No newline at end of file
+httpx>=0.25.1
+python-jose[cryptography]>=3.3.0
+passlib[bcrypt]>=1.7.4
+email-validator>=2.1.0
\ No newline at end of file