diff --git a/backend/app/api/auth.py b/backend/app/api/auth.py
new file mode 100644
index 0000000..9681457
--- /dev/null
+++ b/backend/app/api/auth.py
@@ -0,0 +1,51 @@
+from fastapi import APIRouter, Depends, HTTPException, Response, status
+from sqlalchemy.orm import Session
+from app import models, schemas
+from app.auth import create_access_token, get_current_user, hash_password, verify_password
+from app.database import get_db
+
+router = APIRouter()
+
+
+@router.post("/register", response_model=schemas.UserOut, status_code=201)
+def register(body: schemas.UserCreate, db: Session = Depends(get_db)) -> models.User:
+    if db.query(models.User).filter(models.User.username == body.username).first():
+        raise HTTPException(status_code=400, detail="Username already registered")
+    if db.query(models.User).filter(models.User.email == body.email).first():
+        raise HTTPException(status_code=400, detail="Email already registered")
+    user = models.User(
+        username=body.username,
+        email=body.email,
+        hashed_password=hash_password(body.password),
+    )
+    db.add(user)
+    db.commit()
+    db.refresh(user)
+    return user
+
+
+@router.post("/login")
+def login(body: schemas.LoginRequest, response: Response, db: Session = Depends(get_db)) -> dict:
+    user = db.query(models.User).filter(models.User.username == body.username).first()
+    if not user or not verify_password(body.password, user.hashed_password):
+        raise HTTPException(status_code=401, detail="Invalid credentials")
+    token = create_access_token(user.id)
+    response.set_cookie(
+        key="access_token",
+        value=token,
+        httponly=True,
+        samesite="lax",
+        max_age=3600,
+    )
+    return {"message": "Logged in"}
+
+
+@router.post("/logout")
+def logout(response: Response) -> dict:
+    response.delete_cookie("access_token")
+    return {"message": "Logged out"}
+
+
+@router.get("/me", response_model=schemas.UserOut)
+def me(current_user: models.User = Depends(get_current_user)) -> models.User:
+    return current_user