diff --git a/app/modules/favorite/dependencies.py b/app/modules/favorite/dependencies.py
new file mode 100644
index 0000000..8467b98
--- /dev/null
+++ b/app/modules/favorite/dependencies.py
@@ -0,0 +1,17 @@
+from typing import Annotated
+
+from fastapi import Depends
+
+from app.core.database import DbSessionDep
+from app.modules.favorite.repository import FavoriteRepository
+from app.modules.favorite.service import FavoriteService
+from app.modules.project.dependencies import get_project_service
+
+
+def get_favorite_service(session: DbSessionDep) -> FavoriteService:
+    repository = FavoriteRepository(session)
+    project_service = get_project_service(session)
+    return FavoriteService(session, repository, project_service)
+
+
+FavoriteServiceDep = Annotated[FavoriteService, Depends(get_favorite_service)]
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diff --git a/app/modules/favorite/repository.py b/app/modules/favorite/repository.py
new file mode 100644
index 0000000..79663fa
--- /dev/null
+++ b/app/modules/favorite/repository.py
@@ -0,0 +1,28 @@
+from uuid import UUID
+
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlmodel import select
+
+from app.modules.favorite.models import Favorite
+
+
+class FavoriteRepository:
+    def __init__(self, session: AsyncSession):
+        self.session = session
+
+    async def get_by_project_member(self, project_id: UUID, member_id: UUID) -> Favorite | None:
+        stmt = select(Favorite).where(
+            Favorite.project_id == project_id,
+            Favorite.member_id == member_id,
+        )
+        result = await self.session.execute(stmt)
+        return result.scalar()
+
+    async def create_favorite(self, favorite: Favorite) -> Favorite:
+        self.session.add(favorite)
+        await self.session.flush()
+        return favorite
+
+    async def delete_favorite(self, favorite: Favorite) -> None:
+        await self.session.delete(favorite)
+        await self.session.flush()
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diff --git a/app/modules/favorite/router.py b/app/modules/favorite/router.py
new file mode 100644
index 0000000..2afc4b8
--- /dev/null
+++ b/app/modules/favorite/router.py
@@ -0,0 +1,34 @@
+from typing import Annotated
+from uuid import UUID
+
+from fastapi import APIRouter, Path
+
+from app.modules.favorite.dependencies import FavoriteServiceDep
+from app.modules.favorite.schemas import FavoriteOut
+from app.modules.member.dependencies import CurrentMemberDep
+from app.shared.schemas import ApiResponse
+
+router = APIRouter(prefix="/favorite", tags=["Favorite"])
+
+
+@router.post(
+    path="/{project_id}",
+    response_model=ApiResponse[FavoriteOut],
+    summary="프로젝트 즐겨찾기",
+    description="특정 프로젝트를 즐겨찾기에 추가하거나 이미 존재하면 삭제합니다.",
+)
+async def favorite_project(
+    service: FavoriteServiceDep,
+    current_member: CurrentMemberDep,
+    project_id: Annotated[UUID, Path(..., description="프로젝트 ID")],
+):
+    is_favorite = await service.favorite(project_id, current_member.id)
+
+    return ApiResponse.success(
+        code="FAVORITE_UPDATED",
+        message="즐겨찾기 상태 변경 성공",
+        data=FavoriteOut(
+            project_id=project_id,
+            is_favorite=is_favorite,
+        )
+    )
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diff --git a/app/modules/favorite/schemas.py b/app/modules/favorite/schemas.py
new file mode 100644
index 0000000..3ebe8e7
--- /dev/null
+++ b/app/modules/favorite/schemas.py
@@ -0,0 +1,17 @@
+from uuid import UUID
+
+from sqlmodel import SQLModel, Field
+
+
+class FavoriteOut(SQLModel):
+    project_id: UUID = Field(description="프로젝트 ID")
+    is_favorite: bool = Field(description="즐겨찾기 여부")
+
+    model_config = {
+        "json_schema_extra": {
+            "example": {
+                "project_id": "3e1672cf-8d99-4b1c-9b5e-9c3ece11b089",
+                "is_favorite": True,
+            }
+        }
+    }
\ No newline at end of file
diff --git a/app/modules/favorite/service.py b/app/modules/favorite/service.py
new file mode 100644
index 0000000..fbeec4f
--- /dev/null
+++ b/app/modules/favorite/service.py
@@ -0,0 +1,68 @@
+from uuid import UUID
+
+from sqlalchemy.exc import IntegrityError
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.core.exceptions import AppError
+from app.modules.favorite.models import Favorite
+from app.modules.favorite.repository import FavoriteRepository
+from app.modules.project.service import ProjectService
+
+
+class FavoriteService:
+    def __init__(
+        self,
+        session: AsyncSession,
+        repository: FavoriteRepository,
+        project_service: ProjectService,
+    ):
+        self.session = session
+        self.repository = repository
+        self.project_service = project_service
+
+    async def create(self, project_id: UUID, member_id: UUID) -> Favorite:
+        project = await self.project_service.get(project_id, include_deleted=False)
+        if not project:
+            raise AppError.not_found(f"Project[{project_id}]")
+
+        exists = await self.repository.get_by_project_member(project_id, member_id)
+        if exists:
+            raise AppError.bad_request("이미 즐겨찾기한 프로젝트입니다.")
+
+        favorite = Favorite(
+            project_id=project_id,
+            member_id=member_id,
+        )
+
+        try:
+            created = await self.repository.create_favorite(favorite)
+            await self.session.commit()
+            await self.session.refresh(created)
+            return created
+
+        except IntegrityError:
+            await self.session.rollback()
+            raise AppError.bad_request("즐겨찾기 추가 중 무결성 오류가 발생했습니다.")
+
+    async def delete(self, project_id: UUID, member_id: UUID) -> None:
+        favorite = await self.repository.get_by_project_member(project_id, member_id)
+        if not favorite:
+            raise AppError.not_found("즐겨찾기하지 않은 프로젝트입니다.")
+
+        try:
+            await self.repository.delete_favorite(favorite)
+            await self.session.commit()
+
+        except Exception:
+            await self.session.rollback()
+            raise
+
+    async def favorite(self, project_id: UUID, member_id: UUID) -> bool:
+        favorite = await self.repository.get_by_project_member(project_id, member_id)
+
+        if favorite:
+            await self.delete(project_id, member_id)
+            return False
+
+        await self.create(project_id, member_id)
+        return True
\ No newline at end of file