diff --git a/test/testcases/test_http_api/common.py b/test/testcases/test_http_api/common.py
index 24ca06fc5..ee6e41eb8 100644
--- a/test/testcases/test_http_api/common.py
+++ b/test/testcases/test_http_api/common.py
@@ -781,3 +781,29 @@ def list_group_members(
         url=url, headers=headers, auth=auth, params=params
     )
     return res.json()
+
+
+def delete_group(
+    auth: Union[AuthBase, str, None],
+    group_id: str,
+    *,
+    headers: Dict[str, str] = HEADERS,
+) -> Dict[str, Any]:
+    """Delete a group.
+
+    Args:
+        auth: Authentication object (AuthBase subclass), token string, or None.
+        group_id: The group ID to delete.
+        headers: Optional HTTP headers. Defaults to HEADERS.
+
+    Returns:
+        JSON response as a dictionary containing the deletion result.
+
+    Raises:
+        requests.RequestException: If the HTTP request fails.
+    """
+    url: str = f"{HOST_ADDRESS}{GROUP_API_URL}/{group_id}"
+    res: requests.Response = requests.delete(
+        url=url, headers=headers, auth=auth
+    )
+    return res.json()
diff --git a/test/testcases/test_http_api/test_group_management/test_delete_group.py b/test/testcases/test_http_api/test_group_management/test_delete_group.py
new file mode 100644
index 000000000..88a49fe58
--- /dev/null
+++ b/test/testcases/test_http_api/test_group_management/test_delete_group.py
@@ -0,0 +1,393 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+from __future__ import annotations
+
+import time
+import uuid
+from typing import Any
+
+import pytest
+
+from common import (
+    add_group_members,
+    add_users_to_team,
+    create_group,
+    create_team,
+    create_user,
+    delete_group,
+    encrypt_password,
+    get_user_info,
+    login_as_user,
+)
+from configs import INVALID_API_TOKEN
+from libs.auth import RAGFlowWebApiAuth
+
+
+# ---------------------------------------------------------------------------
+# Test Classes
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.p1
+class TestAuthorization:
+    """Tests for authentication behavior when deleting a group."""
+
+    @pytest.mark.parametrize(
+        ("invalid_auth", "expected_code", "expected_message"),
+        [
+            (None, 401, "Unauthorized"),
+            (RAGFlowWebApiAuth(INVALID_API_TOKEN), 401, "Unauthorized"),
+        ],
+    )
+    def test_invalid_auth(
+        self,
+        invalid_auth: RAGFlowWebApiAuth | None,
+        expected_code: int,
+        expected_message: str,
+        web_api_auth: RAGFlowWebApiAuth,
+    ) -> None:
+        """Test deleting a group with invalid or missing authentication."""
+        # Create a team and group first
+        team_name: str = f"Test Team {uuid.uuid4().hex[:8]}"
+        team_payload: dict[str, str] = {"name": team_name}
+        team_res: dict[str, Any] = create_team(web_api_auth, team_payload)
+        if team_res["code"] != 0:
+            pytest.skip("Team creation failed, skipping auth test")
+        
+        tenant_id: str = team_res["data"]["id"]
+        
+        group_name: str = f"Test Group {uuid.uuid4().hex[:8]}"
+        group_payload: dict[str, str] = {
+            "name": group_name,
+            "tenant_id": tenant_id,
+        }
+        group_res: dict[str, Any] = create_group(web_api_auth, group_payload)
+        if group_res["code"] != 0:
+            pytest.skip("Group creation failed, skipping auth test")
+        
+        group_id: str = group_res["data"]["id"]
+        
+        # Try to delete group with invalid auth
+        res: dict[str, Any] = delete_group(invalid_auth, group_id)
+        assert res["code"] == expected_code, res
+        if expected_message:
+            assert expected_message in res["message"]
+
+
+@pytest.mark.p1
+class TestDeleteGroup:
+    """Comprehensive tests for deleting a group."""
+
+    @pytest.fixture
+    def test_team(self, web_api_auth: RAGFlowWebApiAuth) -> dict[str, Any]:
+        """Create a test team for use in tests."""
+        team_payload: dict[str, str] = {"name": f"Test Team {uuid.uuid4().hex[:8]}"}
+        res: dict[str, Any] = create_team(web_api_auth, team_payload)
+        assert res["code"] == 0
+        return res["data"]
+
+    @pytest.fixture
+    def test_group(
+        self, web_api_auth: RAGFlowWebApiAuth, test_team: dict[str, Any]
+    ) -> dict[str, Any]:
+        """Create a test group for use in tests."""
+        group_payload: dict[str, str] = {
+            "name": f"Test Group {uuid.uuid4().hex[:8]}",
+            "tenant_id": test_team["id"],
+        }
+        res: dict[str, Any] = create_group(web_api_auth, group_payload)
+        assert res["code"] == 0
+        return res["data"]
+
+    @pytest.fixture
+    def test_group_with_members(
+        self,
+        web_api_auth: RAGFlowWebApiAuth,
+        test_group: dict[str, Any],
+        test_team: dict[str, Any],
+    ) -> dict[str, Any]:
+        """Create a test group and add the current user as a member."""
+        # Get current user ID
+        user_info_res: dict[str, Any] = get_user_info(web_api_auth)
+        if user_info_res["code"] == 0:
+            user_id: str = user_info_res["data"]["id"]
+            # Add current user to group (they're already team owner/admin)
+            add_payload: dict[str, list[str]] = {"user_ids": [user_id]}
+            add_group_members(web_api_auth, test_group["id"], add_payload)
+        return test_group
+
+    @pytest.mark.p1
+    def test_delete_group_success(
+        self,
+        web_api_auth: RAGFlowWebApiAuth,
+        test_group_with_members: dict[str, Any],
+    ) -> None:
+        """Test successfully deleting a group."""
+        group_id: str = test_group_with_members["id"]
+        
+        # Delete the group
+        res: dict[str, Any] = delete_group(web_api_auth, group_id)
+        assert res["code"] == 0, res
+        assert res["data"] is True
+        assert "deleted successfully" in res["message"].lower()
+
+    @pytest.mark.p1
+    def test_delete_group_invalid_id(
+        self, web_api_auth: RAGFlowWebApiAuth
+    ) -> None:
+        """Test deleting a group with an invalid group ID."""
+        invalid_id: str = f"invalid_{uuid.uuid4().hex[:8]}"
+        res: dict[str, Any] = delete_group(web_api_auth, invalid_id)
+        assert res["code"] == 102  # DATA_ERROR
+        assert "not found" in res["message"].lower()
+
+    @pytest.mark.p1
+    def test_delete_group_not_team_admin_or_owner(
+        self,
+        web_api_auth: RAGFlowWebApiAuth,
+        test_group: dict[str, Any],
+    ) -> None:
+        """Test deleting a group when user is not team admin or owner."""
+        # Create a new user with encrypted password
+        email: str = f"testuser_{uuid.uuid4().hex[:8]}@example.com"
+        password = "TestPassword123!"
+        encrypted_password = encrypt_password(password)
+        user_payload: dict[str, str] = {
+            "email": email,
+            "password": encrypted_password,
+            "nickname": "Test User",
+        }
+        user_res: dict[str, Any] = create_user(web_api_auth, user_payload)
+        if user_res["code"] != 0:
+            pytest.skip("User creation failed")
+        
+        # Add user to team as normal member
+        team_id: str = test_group["tenant_id"]
+        add_payload: dict[str, list[str]] = {"users": [email]}
+        add_users_to_team(web_api_auth, team_id, add_payload)
+        
+        # Small delay to ensure user is fully created
+        time.sleep(0.5)
+        
+        # Login as the new user (normal member, not admin/owner)
+        new_user_auth: RAGFlowWebApiAuth = login_as_user(email, password)
+        
+        # Try to delete group (user is member but not admin/owner)
+        res: dict[str, Any] = delete_group(new_user_auth, test_group["id"])
+        assert res["code"] == 108  # PERMISSION_ERROR
+        assert "owner" in res["message"].lower() or "admin" in res["message"].lower()
+
+    @pytest.mark.p1
+    def test_delete_group_response_structure(
+        self,
+        web_api_auth: RAGFlowWebApiAuth,
+        test_group_with_members: dict[str, Any],
+    ) -> None:
+        """Test that group deletion returns the expected response structure."""
+        group_id: str = test_group_with_members["id"]
+        
+        res: dict[str, Any] = delete_group(web_api_auth, group_id)
+        assert res["code"] == 0
+        assert "data" in res
+        assert res["data"] is True
+        assert "message" in res
+        assert isinstance(res["message"], str)
+        assert "deleted successfully" in res["message"].lower()
+
+    @pytest.mark.p1
+    def test_delete_group_already_deleted(
+        self,
+        web_api_auth: RAGFlowWebApiAuth,
+        test_group_with_members: dict[str, Any],
+    ) -> None:
+        """Test deleting a group that has already been deleted."""
+        group_id: str = test_group_with_members["id"]
+        
+        # Delete the group first
+        res1: dict[str, Any] = delete_group(web_api_auth, group_id)
+        assert res1["code"] == 0
+        
+        # Try to delete again
+        res2: dict[str, Any] = delete_group(web_api_auth, group_id)
+        # Should return error (group not found or already deleted)
+        assert res2["code"] != 0
+        assert "not found" in res2["message"].lower() or "deleted" in res2["message"].lower()
+
+    @pytest.mark.p1
+    def test_delete_group_with_members(
+        self,
+        web_api_auth: RAGFlowWebApiAuth,
+        test_group: dict[str, Any],
+        test_team: dict[str, Any],
+    ) -> None:
+        """Test deleting a group that has members."""
+        # Create test users
+        users = []
+        for i in range(2):
+            email = f"testuser{i}_{uuid.uuid4().hex[:8]}@example.com"
+            password = "TestPassword123!"
+            encrypted_password = encrypt_password(password)
+            user_payload: dict[str, str] = {
+                "email": email,
+                "password": encrypted_password,
+                "nickname": f"Test User {i}",
+            }
+            user_res: dict[str, Any] = create_user(web_api_auth, user_payload)
+            if user_res["code"] == 0:
+                users.append({"email": email, "id": user_res["data"]["id"]})
+        
+        if not users:
+            pytest.skip("User creation failed")
+        
+        # Add users to team
+        for user in users:
+            add_payload: dict[str, list[str]] = {"users": [user["email"]]}
+            add_users_to_team(web_api_auth, test_team["id"], add_payload)
+        
+        # Add users to group
+        user_ids: list[str] = [user["id"] for user in users]
+        group_add_payload: dict[str, list[str]] = {"user_ids": user_ids}
+        add_group_members(web_api_auth, test_group["id"], group_add_payload)
+        
+        # Delete the group (should also remove all member relationships)
+        res: dict[str, Any] = delete_group(web_api_auth, test_group["id"])
+        assert res["code"] == 0, res
+        assert res["data"] is True
+        assert "member relationships" in res["message"].lower() or "deleted successfully" in res["message"].lower()
+
+    @pytest.mark.p1
+    def test_delete_group_removes_member_relationships(
+        self,
+        web_api_auth: RAGFlowWebApiAuth,
+        test_group: dict[str, Any],
+        test_team: dict[str, Any],
+    ) -> None:
+        """Test that deleting a group removes all member relationships."""
+        from common import list_group_members
+        
+        # Create and add a user to the group
+        email = f"testuser_{uuid.uuid4().hex[:8]}@example.com"
+        password = "TestPassword123!"
+        encrypted_password = encrypt_password(password)
+        user_payload: dict[str, str] = {
+            "email": email,
+            "password": encrypted_password,
+            "nickname": "Test User",
+        }
+        user_res: dict[str, Any] = create_user(web_api_auth, user_payload)
+        if user_res["code"] != 0:
+            pytest.skip("User creation failed")
+        
+        user_id: str = user_res["data"]["id"]
+        
+        # Add user to team
+        add_team_payload: dict[str, list[str]] = {"users": [email]}
+        add_users_to_team(web_api_auth, test_team["id"], add_team_payload)
+        
+        # Add user to group
+        add_group_payload: dict[str, list[str]] = {"user_ids": [user_id]}
+        add_group_members(web_api_auth, test_group["id"], add_group_payload)
+        
+        # Verify user is in group
+        list_res_before: dict[str, Any] = list_group_members(web_api_auth, test_group["id"])
+        assert list_res_before["code"] == 0
+        member_user_ids_before: set[str] = {
+            member["user_id"] for member in list_res_before["data"]
+        }
+        assert user_id in member_user_ids_before
+        
+        # Delete the group
+        delete_res: dict[str, Any] = delete_group(web_api_auth, test_group["id"])
+        assert delete_res["code"] == 0
+        
+        # Try to list members (should fail - group deleted)
+        list_res_after: dict[str, Any] = list_group_members(web_api_auth, test_group["id"])
+        assert list_res_after["code"] != 0
+        assert "not found" in list_res_after["message"].lower()
+
+    @pytest.mark.p2
+    def test_delete_multiple_groups(
+        self,
+        web_api_auth: RAGFlowWebApiAuth,
+        test_team: dict[str, Any],
+    ) -> None:
+        """Test deleting multiple groups from the same team."""
+        # Create multiple groups
+        groups = []
+        for i in range(3):
+            group_name: str = f"Group {i} {uuid.uuid4().hex[:8]}"
+            group_payload: dict[str, str] = {
+                "name": group_name,
+                "tenant_id": test_team["id"],
+            }
+            group_res: dict[str, Any] = create_group(web_api_auth, group_payload)
+            if group_res["code"] == 0:
+                groups.append(group_res["data"])
+        
+        if not groups:
+            pytest.skip("Group creation failed")
+        
+        # Delete all groups
+        for group in groups:
+            res: dict[str, Any] = delete_group(web_api_auth, group["id"])
+            assert res["code"] == 0, f"Failed to delete group {group['id']}: {res}"
+
+    @pytest.mark.p2
+    def test_delete_group_empty_string_id(
+        self, web_api_auth: RAGFlowWebApiAuth
+    ) -> None:
+        """Test deleting a group with empty string ID."""
+        res: dict[str, Any] = delete_group(web_api_auth, "")
+        assert res["code"] != 0
+        assert "not found" in res["message"].lower() or res["code"] in [100, 102, 405]
+
+    @pytest.mark.p2
+    def test_delete_group_special_characters_id(
+        self, web_api_auth: RAGFlowWebApiAuth
+    ) -> None:
+        """Test deleting a group with special characters in ID."""
+        invalid_id: str = "group-123_!@#$%"
+        res: dict[str, Any] = delete_group(web_api_auth, invalid_id)
+        assert res["code"] != 0
+        assert "not found" in res["message"].lower() or res["code"] in [100, 102, 405]
+
+    @pytest.mark.p2
+    def test_delete_group_and_recreate(
+        self,
+        web_api_auth: RAGFlowWebApiAuth,
+        test_team: dict[str, Any],
+    ) -> None:
+        """Test deleting a group and then recreating a group with the same name."""
+        group_name: str = f"Test Group {uuid.uuid4().hex[:8]}"
+        group_payload: dict[str, str] = {
+            "name": group_name,
+            "tenant_id": test_team["id"],
+        }
+        
+        # Create group
+        create_res: dict[str, Any] = create_group(web_api_auth, group_payload)
+        assert create_res["code"] == 0
+        group_id: str = create_res["data"]["id"]
+        
+        # Delete group
+        delete_res: dict[str, Any] = delete_group(web_api_auth, group_id)
+        assert delete_res["code"] == 0
+        
+        # Recreate group with same name (should work - soft delete)
+        recreate_res: dict[str, Any] = create_group(web_api_auth, group_payload)
+        assert recreate_res["code"] == 0
+        assert recreate_res["data"]["name"] == group_name
+