diff --git a/submit-api/src/submit_api/resources/staff/staff_user.py b/submit-api/src/submit_api/resources/staff/staff_user.py
index b9a3a177..cc0cd14d 100644
--- a/submit-api/src/submit_api/resources/staff/staff_user.py
+++ b/submit-api/src/submit_api/resources/staff/staff_user.py
@@ -27,7 +27,7 @@
 from submit_api.utils.roles import EpicSubmitRole
 from submit_api.utils.util import allowedorigins, cors_preflight
 
-API = Namespace("staff-user", description="Endpoints for Staff Management")
+API = Namespace("staff-users", description="Endpoints for Staff Management")
 """Custom exception messages
 """
 
diff --git a/submit-api/tests/unit/resources/test_staff_user.py b/submit-api/tests/unit/resources/test_staff_user.py
new file mode 100644
index 00000000..4093a764
--- /dev/null
+++ b/submit-api/tests/unit/resources/test_staff_user.py
@@ -0,0 +1,245 @@
+"""Test Staff User API endpoints.
+
+Tests for staff user resource endpoints.
+"""
+
+from http import HTTPStatus
+from unittest.mock import patch
+
+from faker import Faker
+
+from submit_api.models.user import UserType
+from tests.utilities.factory_scenarios import TestJwtClaims
+from tests.utilities.factory_utils import (
+    factory_auth_header,
+    factory_user_model,
+)
+
+fake = Faker()
+
+
+def test_get_staff_user_by_guid(client, session, jwt):
+    """Test fetching a staff user by GUID."""
+    # Create a staff user
+    auth_guid = TestJwtClaims.staff_admin_role['preferred_username']
+    user = factory_user_model(auth_guid=auth_guid, user_type=UserType.STAFF, session=session)
+
+    # Create staff_user record
+    from submit_api.models.staff_user import StaffUser
+    staff_user_data = {
+        'first_name': fake.first_name(),
+        'last_name': fake.last_name(),
+        'work_email_address': fake.email(),
+        'user_id': user.id
+    }
+    staff_user = StaffUser.create_staff_user(staff_user_data, session=session)
+    session.commit()
+
+    # Make request
+    headers = factory_auth_header(jwt=jwt, claims=TestJwtClaims.staff_admin_role)
+    response = client.get(f"/api/staff/staff-users/{auth_guid}", headers=headers)
+
+    assert response.status_code == HTTPStatus.OK
+    data = response.get_json()
+    assert data["id"] == staff_user.id
+    assert data["first_name"] == staff_user_data['first_name']
+    assert data["last_name"] == staff_user_data['last_name']
+    assert data["work_email_address"] == staff_user_data['work_email_address']
+
+
+def test_get_staff_user_not_found(client, session, jwt):
+    """Test fetching a non-existent staff user."""
+    headers = factory_auth_header(jwt=jwt, claims=TestJwtClaims.staff_admin_role)
+    response = client.get("/api/staff/staff-users/non-existent-guid", headers=headers)
+
+    assert response.status_code == HTTPStatus.NOT_FOUND
+
+
+def test_get_staff_user_unauthorized(client, session):
+    """Test fetching staff user without authentication."""
+    response = client.get("/api/staff/staff-users/some-guid")
+
+    assert response.status_code == HTTPStatus.UNAUTHORIZED
+
+
+def test_create_staff_user_success(client, session, jwt):
+    """Test creating a staff user and assigning Keycloak role."""
+    email = fake.email()
+    group_name = "EAO_VIEW"
+
+    # Mock Keycloak service responses
+    mock_keycloak_user = {
+        "username": f"{fake.user_name()}@idir",
+        "firstName": fake.first_name(),
+        "lastName": fake.last_name(),
+        "email": email
+    }
+
+    with patch('submit_api.services.staff_user_service.KeycloakService.get_user_by_email') as mock_get_user, \
+         patch('submit_api.services.staff_user_service.KeycloakService.get_group_id_by_path') as mock_get_group, \
+         patch('submit_api.services.staff_user_service.KeycloakService.update_user_group') as mock_update_group:
+
+        mock_get_user.return_value = mock_keycloak_user
+        mock_get_group.return_value = "group-id-123"
+        mock_update_group.return_value = None
+
+        payload = {
+            "email": email,
+            "group_name": group_name
+        }
+
+        headers = factory_auth_header(jwt=jwt, claims=TestJwtClaims.staff_admin_role)
+        response = client.post("/api/staff/staff-users/", json=payload, headers=headers)
+
+        assert response.status_code == HTTPStatus.CREATED
+        data = response.get_json()
+        assert "message" in data
+        assert email in data["message"]
+        assert group_name in data["message"]
+
+        # Verify Keycloak methods were called
+        mock_get_user.assert_called_once_with(email)
+        mock_get_group.assert_called_once_with(group_name)
+        mock_update_group.assert_called_once()
+
+
+def test_create_staff_user_missing_email(client, session, jwt):
+    """Test creating staff user without email."""
+    payload = {
+        "group_name": "EAO_VIEW"
+    }
+
+    headers = factory_auth_header(jwt=jwt, claims=TestJwtClaims.staff_admin_role)
+    response = client.post("/api/staff/staff-users/", json=payload, headers=headers)
+
+    assert response.status_code == HTTPStatus.BAD_REQUEST
+    data = response.get_json()
+    assert "message" in data
+
+
+def test_create_staff_user_missing_group_name(client, session, jwt):
+    """Test creating staff user without group name."""
+    payload = {
+        "email": fake.email()
+    }
+
+    headers = factory_auth_header(jwt=jwt, claims=TestJwtClaims.staff_admin_role)
+    response = client.post("/api/staff/staff-users/", json=payload, headers=headers)
+
+    assert response.status_code == HTTPStatus.BAD_REQUEST
+    data = response.get_json()
+    assert "message" in data
+
+
+def test_create_staff_user_keycloak_error(client, session, jwt):
+    """Test creating staff user when Keycloak service fails."""
+    email = fake.email()
+    group_name = "EAO_VIEW"
+
+    with patch('submit_api.services.staff_user_service.KeycloakService.get_user_by_email') as mock_get_user:
+        mock_get_user.side_effect = Exception("Keycloak connection error")
+
+        payload = {
+            "email": email,
+            "group_name": group_name
+        }
+
+        headers = factory_auth_header(jwt=jwt, claims=TestJwtClaims.staff_admin_role)
+        response = client.post("/api/staff/staff-users/", json=payload, headers=headers)
+
+        assert response.status_code == HTTPStatus.INTERNAL_SERVER_ERROR
+        data = response.get_json()
+        assert "message" in data
+
+
+def test_create_staff_user_unauthorized(client, session):
+    """Test creating staff user without authentication."""
+    payload = {
+        "email": fake.email(),
+        "group_name": "EAO_VIEW"
+    }
+
+    response = client.post("/api/staff/staff-users/", json=payload)
+
+    assert response.status_code == HTTPStatus.UNAUTHORIZED
+
+
+def test_create_staff_user_without_manage_users_role(client, session, jwt):
+    """Test creating staff user without MANAGE_USERS role."""
+    # Use proponent role which doesn't have MANAGE_USERS permission
+    payload = {
+        "email": fake.email(),
+        "group_name": "EAO_VIEW"
+    }
+
+    headers = factory_auth_header(jwt=jwt, claims=TestJwtClaims.proponent_role)
+    response = client.post("/api/staff/staff-users/", json=payload, headers=headers)
+
+    assert response.status_code == HTTPStatus.UNAUTHORIZED
+
+
+def test_get_staff_user_with_existing_user(client, session, jwt):
+    """Test fetching staff user when user exists with staff_user relationship."""
+    auth_guid = f"{fake.user_name()}@idir"
+    user = factory_user_model(auth_guid=auth_guid, user_type=UserType.STAFF, session=session)
+
+    from submit_api.models.staff_user import StaffUser
+    first_name = fake.first_name()
+    last_name = fake.last_name()
+    work_email = fake.email()
+
+    staff_user_data = {
+        'first_name': first_name,
+        'last_name': last_name,
+        'work_email_address': work_email,
+        'user_id': user.id
+    }
+    StaffUser.create_staff_user(staff_user_data, session=session)
+    session.commit()
+
+    headers = factory_auth_header(jwt=jwt, claims=TestJwtClaims.staff_admin_role)
+    response = client.get(f"/api/staff/staff-users/{auth_guid}", headers=headers)
+
+    assert response.status_code == HTTPStatus.OK
+    data = response.get_json()
+    assert data["first_name"] == first_name
+    assert data["last_name"] == last_name
+    assert data["work_email_address"] == work_email
+    assert data["user_id"] == user.id
+
+
+def test_create_staff_user_idempotent(client, session, jwt):
+    """Test creating staff user multiple times is idempotent."""
+    email = fake.email()
+    group_name = "EAO_VIEW"
+    username = f"{fake.user_name()}@idir"
+
+    mock_keycloak_user = {
+        "username": username,
+        "firstName": fake.first_name(),
+        "lastName": fake.last_name(),
+        "email": email
+    }
+
+    with patch('submit_api.services.staff_user_service.KeycloakService.get_user_by_email') as mock_get_user, \
+         patch('submit_api.services.staff_user_service.KeycloakService.get_group_id_by_path') as mock_get_group, \
+         patch('submit_api.services.staff_user_service.KeycloakService.update_user_group') as mock_update_group:
+
+        mock_get_user.return_value = mock_keycloak_user
+        mock_get_group.return_value = "group-id-123"
+        mock_update_group.return_value = None
+
+        payload = {
+            "email": email,
+            "group_name": group_name
+        }
+
+        headers = factory_auth_header(jwt=jwt, claims=TestJwtClaims.staff_admin_role)
+
+        # First creation
+        response1 = client.post("/api/staff/staff-users/", json=payload, headers=headers)
+        assert response1.status_code == HTTPStatus.CREATED
+
+        # Second creation - should still succeed (idempotent)
+        response2 = client.post("/api/staff/staff-users/", json=payload, headers=headers)
+        assert response2.status_code == HTTPStatus.CREATED
diff --git a/submit-web/src/hooks/api/constants.ts b/submit-web/src/hooks/api/constants.ts
index 75b6bc30..629df756 100644
--- a/submit-web/src/hooks/api/constants.ts
+++ b/submit-web/src/hooks/api/constants.ts
@@ -14,7 +14,7 @@ export const QUERY_KEY = Object.freeze({
   SUBMISSIONS: "submissions",
   USERS: "users",
   PACKAGE_VERSIONS: "package-versions",
-  STAFF_USER: "staff/staff-user",
+  STAFF_USER: "staff/staff-users",
   ACTIVITY_LOGS: "activity-logs",
   SUBMISSION_VERSIONS: "submission-versions",
   INVITATION: "invitation",
diff --git a/submit-web/src/hooks/api/useStaffUser.ts b/submit-web/src/hooks/api/useStaffUser.ts
index 2da01d40..d4f2c427 100644
--- a/submit-web/src/hooks/api/useStaffUser.ts
+++ b/submit-web/src/hooks/api/useStaffUser.ts
@@ -11,12 +11,12 @@ type CreateStaffRequest = {
 };
 
 const fetchStaffUserByGUID = (id?: string) => {
-  return submitRequest<StaffUser>({ url: `staff/staff-user/${id}` });
+  return submitRequest<StaffUser>({ url: `staff/staff-users/${id}` });
 };
 
 const addStaffUser = (data: CreateStaffRequest) => {
   return submitRequest<StaffUser>({
-    url: "staff/staff-user",
+    url: "staff/staff-users",
     method: "post",
     data,
   });