diff --git a/backend/app/api/donors.py b/backend/app/api/donors.py
index 134b579..9ea5e48 100644
--- a/backend/app/api/donors.py
+++ b/backend/app/api/donors.py
@@ -1,23 +1,112 @@
-"""Starter endpoints for the Donors API.
+"""Donors REST API.
 
-This module contains a minimal placeholder to extend and implement.
-Refer to `docs/STARTER_BACKEND_GUIDE.md` for implementation
-examples and guidance on using `AsyncSession`, models, and schemas.
+Full CRUD implementation for the Donors resource.
 """
 
-from fastapi import APIRouter, Response, status
+from fastapi import APIRouter, Depends, HTTPException, Response, status
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from ..database import get_db
+from ..schemas import DonorCreate, DonorUpdate, Donor as DonorSchema
+from ..services import donor_service
 
 router = APIRouter()
 
 
-@router.get("")
-async def list_donors():
-    """List donors.
+@router.get("", response_model=list[DonorSchema])
+async def list_donors(db: AsyncSession = Depends(get_db)):
+    """List all donors."""
+    return await donor_service.list_donors(db)
+
+
+@router.post(
+    "",
+    response_model=DonorSchema,
+    status_code=status.HTTP_201_CREATED,
+    responses={400: {"description": "Integrity error (e.g., duplicate donor email)"}},
+)
+async def create_donor(donor: DonorCreate, db: AsyncSession = Depends(get_db)):
+    """Create a new donor."""
+    try:
+        return await donor_service.create_donor(db, donor)
+    except ValueError as e:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=str(e),
+        ) from e
+
+
+@router.get(
+    "/{donor_id}",
+    response_model=DonorSchema,
+    status_code=status.HTTP_200_OK,
+    responses={404: {"description": "Donor not found"}},
+)
+async def get_donor(donor_id: str, db: AsyncSession = Depends(get_db)):
+    """Get a single donor by ID."""
+    donor = await donor_service.get_donor(db, donor_id)
+    if not donor:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Donor not found",
+        )
+    return donor
+
+
+@router.put(
+    "/{donor_id}",
+    response_model=DonorSchema,
+    status_code=status.HTTP_200_OK,
+    responses={
+        400: {"description": "Integrity error (e.g., duplicate donor email)"},
+        404: {"description": "Donor not found"},
+    },
+)
+async def update_donor(
+    donor_id: str, payload: DonorUpdate, db: AsyncSession = Depends(get_db)
+):
+    """Update a donor."""
+    donor = await donor_service.get_donor(db, donor_id)
+    if not donor:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Donor not found",
+        )
+
+    try:
+        return await donor_service.update_donor(db, donor, payload)
+    except ValueError as e:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=str(e),
+        ) from e
+
+
+@router.delete(
+    "/{donor_id}",
+    status_code=status.HTTP_204_NO_CONTENT,
+    responses={
+        400: {
+            "description": "Integrity error (e.g., donor has linked furniture records)"
+        },
+        404: {"description": "Donor not found"},
+    },
+)
+async def delete_donor(donor_id: str, db: AsyncSession = Depends(get_db)):
+    """Delete a donor."""
+    donor = await donor_service.get_donor(db, donor_id)
+    if not donor:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Donor not found",
+        )
+
+    try:
+        await donor_service.delete_donor(db, donor)
+    except ValueError as e:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=str(e),
+        ) from e
 
-    Placeholder implementation. See `docs/STARTER_BACKEND_GUIDE.md` (repo root)
-    for details on implementing this handler.
-    """
-    return Response(
-        content="Not implemented — see docs/STARTER_BACKEND_GUIDE.md",
-        status_code=status.HTTP_501_NOT_IMPLEMENTED,
-    )
+    return Response(status_code=status.HTTP_204_NO_CONTENT)
diff --git a/backend/app/services/__init__.py b/backend/app/services/__init__.py
index ca9fd32..cb51a80 100644
--- a/backend/app/services/__init__.py
+++ b/backend/app/services/__init__.py
@@ -1,8 +1,9 @@
-"""Services package.
-
-Business logic layer; API routes depend on services, not the reverse.
-"""
-
-from . import clients as clients_service
-
-__all__ = ["clients_service"]
+"""Services package.
+
+Business logic layer; API routes depend on services, not the reverse.
+"""
+
+from . import donors as donor_service
+from . import clients as clients_service
+
+__all__ = ["donor_service", "clients_service"]
diff --git a/backend/app/services/donors.py b/backend/app/services/donors.py
new file mode 100644
index 0000000..07351dc
--- /dev/null
+++ b/backend/app/services/donors.py
@@ -0,0 +1,70 @@
+"""Donor services module.
+
+Contains business logic for donor-related operations.
+"""
+
+from sqlalchemy import select
+from sqlalchemy.exc import IntegrityError
+from sqlalchemy.ext.asyncio import AsyncSession
+from ..models import Donor
+from ..schemas import DonorCreate, DonorUpdate
+
+
+async def list_donors(db: AsyncSession) -> list[Donor]:
+    """List all donors."""
+    result = await db.execute(select(Donor).order_by(Donor.name))
+    return result.scalars().all()
+
+
+async def create_donor(db: AsyncSession, donor: DonorCreate) -> Donor:
+    """Create a new donor."""
+    try:
+        db_donor = Donor(**donor.model_dump())
+        db.add(db_donor)
+        await db.commit()
+        await db.refresh(db_donor)
+        return db_donor
+    except IntegrityError as e:
+        await db.rollback()
+        raise ValueError(f"Unable to create donor: {str(e.orig)}") from e
+    except Exception:
+        await db.rollback()
+        raise
+
+
+async def get_donor(db: AsyncSession, donor_id: str) -> Donor | None:
+    """Get a single donor by ID."""
+    result = await db.execute(select(Donor).where(Donor.id == donor_id))
+    return result.scalar_one_or_none()
+
+
+async def update_donor(db: AsyncSession, donor: Donor, payload: DonorUpdate) -> Donor:
+    """Update a donor."""
+    try:
+        # Only update fields that were actually provided in the request
+        update_data = payload.model_dump(exclude_unset=True)
+        for key, value in update_data.items():
+            setattr(donor, key, value)
+
+        await db.commit()
+        await db.refresh(donor)
+        return donor
+    except IntegrityError as e:
+        await db.rollback()
+        raise ValueError(f"Unable to update donor: {str(e.orig)}") from e
+    except Exception:
+        await db.rollback()
+        raise
+
+
+async def delete_donor(db: AsyncSession, donor: Donor) -> None:
+    """Delete a donor."""
+    try:
+        await db.delete(donor)
+        await db.commit()
+    except IntegrityError as e:
+        await db.rollback()
+        raise ValueError(f"Unable to delete donor: {str(e.orig)}") from e
+    except Exception:
+        await db.rollback()
+        raise