diff --git a/frontend/src/locale/en.json b/frontend/src/locale/en.json
index 6f7e27295..733c653e7 100644
--- a/frontend/src/locale/en.json
+++ b/frontend/src/locale/en.json
@@ -576,7 +576,8 @@
     "required": "This is required field"
   },
   "users_autosuggest": {
-    "placeholder": "Add member",
+    "placeholder": "Enter username or email to add member",
+    "entered_text": "Add member",
     "loading": "Loading users",
     "no_match": "No matches found"
   },
diff --git a/frontend/src/pages/Project/Members/UsersAutosuggest/index.tsx b/frontend/src/pages/Project/Members/UsersAutosuggest/index.tsx
index 5a3f35f62..fdb7d9ff8 100644
--- a/frontend/src/pages/Project/Members/UsersAutosuggest/index.tsx
+++ b/frontend/src/pages/Project/Members/UsersAutosuggest/index.tsx
@@ -35,7 +35,7 @@ export const UserAutosuggest: React.FC<Props> = ({ optionsFilter, onSelect: onSe
     return (
         <Autosuggest
             value={value}
-            enteredTextLabel={(text) => `${t('users_autosuggest.placeholder')} ${text}`}
+            enteredTextLabel={(text) => `${t('users_autosuggest.entered_text')} ${text}`}
             onChange={({ detail }) => setValue(detail.value)}
             options={filteredOptions}
             statusType={isUsersLoading ? 'loading' : undefined}
diff --git a/src/dstack/_internal/server/schemas/projects.py b/src/dstack/_internal/server/schemas/projects.py
index e51528bf0..18f85f15c 100644
--- a/src/dstack/_internal/server/schemas/projects.py
+++ b/src/dstack/_internal/server/schemas/projects.py
@@ -1,4 +1,6 @@
-from typing import List
+from typing import Annotated, List
+
+from pydantic import Field
 
 from dstack._internal.core.models.common import CoreModel
 from dstack._internal.core.models.users import ProjectRole
@@ -13,7 +15,10 @@ class DeleteProjectsRequest(CoreModel):
 
 
 class MemberSetting(CoreModel):
-    username: str
+    username: Annotated[
+        str,
+        Field(description="The username or email of the user"),
+    ]
     project_role: ProjectRole
 
 
diff --git a/src/dstack/_internal/server/services/projects.py b/src/dstack/_internal/server/services/projects.py
index 2c2b135f8..7fc4cd909 100644
--- a/src/dstack/_internal/server/services/projects.py
+++ b/src/dstack/_internal/server/services/projects.py
@@ -179,12 +179,16 @@ async def set_project_members(
     # FIXME: potentially long write transaction
     # clear_project_members() issues DELETE without commit
     await clear_project_members(session=session, project=project)
-    usernames = [m.username for m in members]
-    res = await session.execute(select(UserModel).where(UserModel.name.in_(usernames)))
+    names = [m.username for m in members]
+    res = await session.execute(
+        select(UserModel).where((UserModel.name.in_(names)) | (UserModel.email.in_(names)))
+    )
     users = res.scalars().all()
+    # Create lookup maps for both username and email
     username_to_user = {user.name: user for user in users}
+    email_to_user = {user.email: user for user in users if user.email}
     for i, member in enumerate(members):
-        user_to_add = username_to_user.get(member.username)
+        user_to_add = username_to_user.get(member.username) or email_to_user.get(member.username)
         if user_to_add is None:
             continue
         await add_project_member(
diff --git a/src/tests/_internal/server/routers/test_projects.py b/src/tests/_internal/server/routers/test_projects.py
index c4deb32ed..ab655cf40 100644
--- a/src/tests/_internal/server/routers/test_projects.py
+++ b/src/tests/_internal/server/routers/test_projects.py
@@ -503,6 +503,62 @@ async def test_sets_project_members(self, test_db, session: AsyncSession, client
         members = res.scalars().all()
         assert len(members) == 3
 
+    @pytest.mark.asyncio
+    @pytest.mark.parametrize("test_db", ["sqlite", "postgres"], indirect=True)
+    async def test_sets_project_members_by_email(
+        self, test_db, session: AsyncSession, client: AsyncClient
+    ):
+        project = await create_project(
+            session=session,
+            created_at=datetime(2023, 1, 2, 3, 4, tzinfo=timezone.utc),
+        )
+        admin = await create_user(
+            session=session,
+            created_at=datetime(2023, 1, 2, 3, 4, tzinfo=timezone.utc),
+            global_role=GlobalRole.ADMIN,
+        )
+        user1 = await create_user(
+            session=session,
+            name="user1",
+            created_at=datetime(2023, 1, 2, 3, 4, tzinfo=timezone.utc),
+            email="testemail@example.com",
+        )
+        members = [
+            {
+                "username": user1.email,
+                "project_role": ProjectRole.ADMIN,
+            },
+        ]
+        body = {"members": members}
+        response = await client.post(
+            f"/api/projects/{project.name}/set_members",
+            headers=get_auth_headers(admin.token),
+            json=body,
+        )
+        assert response.status_code == 200, response.json()
+        assert response.json()["members"] == [
+            {
+                "user": {
+                    "id": str(user1.id),
+                    "username": user1.name,
+                    "created_at": "2023-01-02T03:04:00+00:00",
+                    "global_role": user1.global_role,
+                    "email": user1.email,
+                    "active": True,
+                    "permissions": {
+                        "can_create_projects": True,
+                    },
+                },
+                "project_role": ProjectRole.ADMIN,
+                "permissions": {
+                    "can_manage_ssh_fleets": True,
+                },
+            },
+        ]
+        res = await session.execute(select(MemberModel))
+        members = res.scalars().all()
+        assert len(members) == 1
+
     @pytest.mark.asyncio
     @pytest.mark.parametrize("test_db", ["sqlite", "postgres"], indirect=True)
     async def test_manager_cannot_set_project_admins(