diff --git a/frontend/src/components/TabManager.tsx b/frontend/src/components/TabManager.tsx
index e5f5008e..450091a5 100644
--- a/frontend/src/components/TabManager.tsx
+++ b/frontend/src/components/TabManager.tsx
@@ -12,6 +12,8 @@ import type { ExternalSQLDirectory, SavedConnection, SavedQuery, TabData } from
 import { t } from '../i18n';
 import {
   buildTabDisplayModel,
+  buildConnectionGroupNameIndex,
+  getConnectionGroupName,
   resolveConnectionHostSummary,
   type TabDisplayPart,
   type TabDisplayModel,
@@ -733,6 +735,7 @@ const TabManager: React.FC<TabManagerProps> = React.memo<TabManagerProps>(({ onF
   const tabs = useWorkbenchTabs();
   const detachedWorkbenchWindows = useStore(state => state.detachedWorkbenchWindows);
   const connections = useStore(state => state.connections);
+  const connectionTags = useStore(state => state.connectionTags);
   const savedQueries = useStore(state => state.savedQueries);
   const externalSQLDirectories = useStore(state => state.externalSQLDirectories);
   const recentConnectionTargets = useStore(state => state.recentConnectionTargets);
@@ -759,6 +762,10 @@ const TabManager: React.FC<TabManagerProps> = React.memo<TabManagerProps>(({ onF
     () => tabs.filter((tab) => !detachedTabIdSet.has(tab.id)),
     [detachedTabIdSet, tabs],
   );
+  const connectionGroupNameById = useMemo(
+    () => buildConnectionGroupNameIndex(connectionTags),
+    [connectionTags],
+  );
   const tabsNavBorderColor = theme === 'dark' ? 'rgba(255, 255, 255, 0.09)' : 'rgba(0, 0, 0, 0.08)';
   const tabWorkbenchRef = useRef<HTMLDivElement>(null);
   const [v2TabWidth, setV2TabWidth] = useState(V2_WORKBENCH_TAB_MAX_WIDTH);
@@ -1052,7 +1059,7 @@ const TabManager: React.FC<TabManagerProps> = React.memo<TabManagerProps>(({ onF
     const tab = dockedTabs.find((item) => item.id === sourceId);
     const connection = connections.find((conn) => conn.id === tab?.connectionId);
     const displayModel = tab
-      ? buildTabDisplayModel(tab, connection, appearance.tabDisplay, t)
+      ? buildTabDisplayModel(tab, connection, appearance.tabDisplay, t, getConnectionGroupName(connectionGroupNameById, tab.connectionId))
       : null;
     const title = displayModel?.fullTitle || tab?.title || t('tab_manager.detached.title_fallback');
     const pointerEvent = event.activatorEvent as PointerEvent | MouseEvent | undefined;
@@ -1242,10 +1249,10 @@ const TabManager: React.FC<TabManagerProps> = React.memo<TabManagerProps>(({ onF
   const hasDoubleLineTabLabel = useMemo(() => (
     dockedTabs.some((tab) => {
       const connection = connections.find((conn) => conn.id === tab.connectionId);
-      const displayModel = buildTabDisplayModel(tab, connection, appearance.tabDisplay, t);
+      const displayModel = buildTabDisplayModel(tab, connection, appearance.tabDisplay, t, getConnectionGroupName(connectionGroupNameById, tab.connectionId));
       return displayModel.layout === 'double' && Boolean(displayModel.secondaryText);
     })
-  ), [appearance.tabDisplay, connections, dockedTabs]);
+  ), [appearance.tabDisplay, connections, connectionGroupNameById, dockedTabs]);
 
   const renderTabBar: TabsProps['renderTabBar'] = (tabBarProps, DefaultTabBar) => (
     <DefaultTabBar {...tabBarProps}>
@@ -1255,7 +1262,7 @@ const TabManager: React.FC<TabManagerProps> = React.memo<TabManagerProps>(({ onF
 
   const items = useMemo(() => dockedTabs.map((tab, index) => {
     const connection = connections.find((conn) => conn.id === tab.connectionId);
-    const displayModel = buildTabDisplayModel(tab, connection, appearance.tabDisplay, t);
+    const displayModel = buildTabDisplayModel(tab, connection, appearance.tabDisplay, t, getConnectionGroupName(connectionGroupNameById, tab.connectionId));
     const environment = connection
       ? resolveConnectionEnvironmentPresentation(connection, t)
       : undefined;
@@ -1339,7 +1346,7 @@ const TabManager: React.FC<TabManagerProps> = React.memo<TabManagerProps>(({ onF
       closable: !isV2Ui,
       children: <WorkbenchTabContent tab={tab} isActive={tabIsActive} />,
     };
-  }), [dockedTabs, dockedActiveTabId, tabs, connections, appearance.tabDisplay, closeOtherTabs, closeTabsToLeft, closeTabsToRight, closeAllTabs, closeTab, closeTabsWithSQLFilePrompt, detachTabToWindow, isV2Ui, languagePreference]);
+  }), [dockedTabs, dockedActiveTabId, tabs, connections, connectionGroupNameById, appearance.tabDisplay, closeOtherTabs, closeTabsToLeft, closeTabsToRight, closeAllTabs, closeTab, closeTabsWithSQLFilePrompt, detachTabToWindow, isV2Ui, languagePreference]);
 
   const queryCapableConnections = useMemo(
     () => connections.filter((connection) => getDataSourceCapabilities(connection.config).supportsQueryEditor),
diff --git a/frontend/src/utils/tabDisplay.test.ts b/frontend/src/utils/tabDisplay.test.ts
index 32036d14..60909d2a 100644
--- a/frontend/src/utils/tabDisplay.test.ts
+++ b/frontend/src/utils/tabDisplay.test.ts
@@ -4,6 +4,7 @@ import { t as catalogTranslate } from '../i18n/catalog';
 import type { SavedConnection, TabData } from '../types';
 import {
   applyTabDisplaySettingsPatch,
+  buildConnectionGroupNameIndex,
   buildTabDisplayModel,
   buildTabDisplayTitle,
   DEFAULT_TAB_DISPLAY_SETTINGS,
@@ -481,7 +482,78 @@ describe('tabDisplay', () => {
       layout: 'double',
       primaryElements: ['object', 'kind'],
       secondaryElements: ['host'],
-    })).toEqual(['object', 'kind', 'host', 'connection', 'database', 'schema']);
+    })).toEqual(['object', 'kind', 'host', 'connection', 'database', 'schema', 'group']);
+  });
+
+  it('renders the connection group name when the group element is enabled', () => {
+    const connection: SavedConnection = {
+      id: 'pg-1',
+      name: 'Postgres PROD',
+      config: {
+        type: 'postgres',
+        host: '10.0.0.9',
+        port: 5432,
+        user: 'postgres',
+        database: 'analytics',
+      },
+    };
+    const tableTab: TabData = {
+      id: 'pg-1-analytics-table-reporting.events',
+      title: 'reporting.events',
+      type: 'table',
+      connectionId: 'pg-1',
+      dbName: 'analytics',
+      tableName: 'reporting.events',
+    };
+
+    const grouped = buildTabDisplayModel(tableTab, connection, {
+      layout: 'double',
+      primaryElements: ['object'],
+      secondaryElements: ['group', 'connection'],
+    }, undefined, '核心交易库');
+
+    expect(grouped.secondaryText).toBe('核心交易库·[PROD]');
+    expect(grouped.fullTitle).toBe('events · 核心交易库·[PROD]');
+  });
+
+  it('omits the group element when the connection has no group name', () => {
+    const tableTab: TabData = {
+      id: 'pg-1-analytics-table-events',
+      title: 'events',
+      type: 'table',
+      connectionId: 'pg-1',
+      dbName: 'analytics',
+      tableName: 'events',
+    };
+
+    const ungrouped = buildTabDisplayModel(tableTab, undefined, {
+      layout: 'double',
+      primaryElements: ['object'],
+      secondaryElements: ['group', 'kind'],
+    }, undefined, '');
+
+    expect(ungrouped.secondaryText).toBe('TABLE');
+    expect(ungrouped.fullTitle).toBe('events · TABLE');
+  });
+
+  it('resolves a connection group name from the first matching tag', () => {
+    const index = buildConnectionGroupNameIndex([
+      { id: 'tag-a', name: '交易库', connectionIds: ['conn-1', 'conn-2'] },
+      { id: 'tag-b', name: '日志库', connectionIds: ['conn-3'] },
+    ]);
+
+    expect(index.get('conn-1')).toBe('交易库');
+    expect(index.get('conn-3')).toBe('日志库');
+    expect(index.get('conn-unknown')).toBeUndefined();
+  });
+
+  it('resolves only the direct group name for a nested connection', () => {
+    const index = buildConnectionGroupNameIndex([
+      { id: 'tag-root', name: '生产环境', connectionIds: [] },
+      { id: 'tag-child', name: '核心交易库', parentTagId: 'tag-root', connectionIds: ['conn-1'] },
+    ]);
+
+    expect(index.get('conn-1')).toBe('核心交易库');
   });
 
   it('keeps separate single-line and double-line settings when switching layouts', () => {
diff --git a/frontend/src/utils/tabDisplay.ts b/frontend/src/utils/tabDisplay.ts
index e871e14d..1abfbc79 100644
--- a/frontend/src/utils/tabDisplay.ts
+++ b/frontend/src/utils/tabDisplay.ts
@@ -1,9 +1,9 @@
-import type { ConnectionConfig, SavedConnection, TabData } from '../types';
+import type { ConnectionConfig, ConnectionTag, SavedConnection, TabData } from '../types';
 import { t as catalogTranslate } from '../i18n/catalog';
 import type { I18nParams } from '../i18n/types';
 import { resolveLocalizedUntitledQueryTitle } from './queryTabTitle';
 
-export const TAB_DISPLAY_ELEMENT_KEYS = ['object', 'kind', 'connection', 'database', 'schema', 'host'] as const;
+export const TAB_DISPLAY_ELEMENT_KEYS = ['object', 'kind', 'connection', 'database', 'schema', 'host', 'group'] as const;
 
 export type TabDisplayElementKey = typeof TAB_DISPLAY_ELEMENT_KEYS[number];
 export type TabDisplayLayout = 'single' | 'double';
@@ -25,7 +25,7 @@ export type TabDisplayTranslate = (key: string, params?: I18nParams) => string;
 
 const defaultTranslate: TabDisplayTranslate = (key, params) => catalogTranslate('en-US', key, params);
 
-export const TAB_DISPLAY_SECONDARY_DEFAULT_KEYS: TabDisplayElementKey[] = ['kind', 'connection', 'database', 'schema', 'host'];
+export const TAB_DISPLAY_SECONDARY_DEFAULT_KEYS: TabDisplayElementKey[] = ['kind', 'connection', 'database', 'schema', 'host', 'group'];
 
 export const TAB_DISPLAY_ELEMENT_META: Record<TabDisplayElementKey, { labelKey: string; descriptionKey: string }> = {
   connection: {
@@ -52,6 +52,10 @@ export const TAB_DISPLAY_ELEMENT_META: Record<TabDisplayElementKey, { labelKey:
     labelKey: 'app.theme.tab_display.element.host.label',
     descriptionKey: 'app.theme.tab_display.element.host.description',
   },
+  group: {
+    labelKey: 'app.theme.tab_display.element.group.label',
+    descriptionKey: 'app.theme.tab_display.element.group.description',
+  },
 };
 
 const DEFAULT_SINGLE_TAB_DISPLAY_SNAPSHOT: TabDisplayLayoutSnapshot = {
@@ -276,6 +280,34 @@ export const resolveConnectionHostSummary = (config?: ConnectionConfig): string
   return `${hosts[0]} +${hosts.length - 1}`;
 };
 
+/**
+ * Builds a connectionId -> group-name lookup from connection tags.
+ * A connection belongs to the first tag (in array order) whose
+ * `connectionIds` contains it, matching the sidebar's ownership
+ * resolution. The lookup helper returns an empty string for ungrouped connections.
+ */
+export const buildConnectionGroupNameIndex = (
+  connectionTags: ConnectionTag[],
+): Map<string, string> => {
+  const map = new Map<string, string>();
+  connectionTags.forEach((tag) => {
+    const groupName = String(tag?.name || '').trim();
+    if (!groupName) return;
+    tag.connectionIds.forEach((connectionId) => {
+      const trimmed = String(connectionId || '').trim();
+      if (trimmed && !map.has(trimmed)) {
+        map.set(trimmed, groupName);
+      }
+    });
+  });
+  return map;
+};
+
+export const getConnectionGroupName = (
+  index: Map<string, string>,
+  connectionId: string | undefined,
+): string => index.get(String(connectionId || '').trim()) || '';
+
 const isRedisTab = (tab: TabData): boolean => {
   return tab.type === 'redis-keys' || tab.type === 'redis-command' || tab.type === 'redis-monitor';
 };
@@ -539,6 +571,7 @@ const getTabDisplayElementValue = (
   tab: TabData,
   connection?: SavedConnection,
   translate: TabDisplayTranslate = defaultTranslate,
+  groupName?: string,
 ): string => {
   const rawObjectLabel = getTabRawObjectLabel(tab, translate);
   switch (key) {
@@ -557,6 +590,8 @@ const getTabDisplayElementValue = (
       return String(tab.schemaName || '').trim() || getSchemaFromTabObjectLabel(rawObjectLabel);
     case 'host':
       return resolveConnectionHostSummary(connection?.config);
+    case 'group':
+      return String(groupName || '').trim();
     default:
       return '';
   }
@@ -589,9 +624,10 @@ const buildTabDisplayParts = (
   tab: TabData,
   connection?: SavedConnection,
   translate: TabDisplayTranslate = defaultTranslate,
+  groupName?: string,
 ): TabDisplayPart[] => keys
   .map((key) => {
-    const value = getTabDisplayElementValue(key, tab, connection, translate);
+    const value = getTabDisplayElementValue(key, tab, connection, translate, groupName);
     return {
       key,
       value,
@@ -605,10 +641,11 @@ export const buildTabDisplayModel = (
   connection?: SavedConnection,
   settings?: Partial<TabDisplaySettings> | null,
   translate: TabDisplayTranslate = defaultTranslate,
+  groupName?: string,
 ): TabDisplayModel => {
   const sanitized = sanitizeTabDisplaySettings(settings);
-  const primaryParts = buildTabDisplayParts(sanitized.primaryElements, tab, connection, translate);
-  const secondaryParts = buildTabDisplayParts(sanitized.secondaryElements, tab, connection, translate);
+  const primaryParts = buildTabDisplayParts(sanitized.primaryElements, tab, connection, translate, groupName);
+  const secondaryParts = buildTabDisplayParts(sanitized.secondaryElements, tab, connection, translate, groupName);
   const primaryText = primaryParts.map((part) => part.text).join(' ').trim() || buildCompactObjectTabTitle(tab, translate);
   const secondaryText = secondaryParts.map((part) => part.text).join('·').trim();
   const fullTitle = [primaryText, secondaryText].filter(Boolean).join(' · ');
@@ -627,9 +664,10 @@ export const buildTabDisplayTitle = (
   connection?: SavedConnection,
   settings?: Partial<TabDisplaySettings> | null,
   translate: TabDisplayTranslate = defaultTranslate,
+  groupName?: string,
 ): string => {
   if (settings) {
-    return buildTabDisplayModel(tab, connection, settings, translate).fullTitle;
+    return buildTabDisplayModel(tab, connection, settings, translate, groupName).fullTitle;
   }
 
   const connectionName = String(connection?.name || '').trim();
diff --git a/frontend/src/v2-theme.css b/frontend/src/v2-theme.css
index f54784ee..8a9ce7d1 100644
--- a/frontend/src/v2-theme.css
+++ b/frontend/src/v2-theme.css
@@ -4106,7 +4106,8 @@ body[data-ui-version="v2"] .gn-v2-tab-label-part-connection {
 
 body[data-ui-version="v2"] .gn-v2-tab-label-part-host,
 body[data-ui-version="v2"] .gn-v2-tab-label-part-database,
-body[data-ui-version="v2"] .gn-v2-tab-label-part-schema {
+body[data-ui-version="v2"] .gn-v2-tab-label-part-schema,
+body[data-ui-version="v2"] .gn-v2-tab-label-part-group {
   flex: 0 2 auto;
   max-width: 112px;
 }
diff --git a/shared/i18n/de-DE.json b/shared/i18n/de-DE.json
index c8282455..93e81776 100644
--- a/shared/i18n/de-DE.json
+++ b/shared/i18n/de-DE.json
@@ -3047,6 +3047,8 @@
   "app.theme.tab_display.element.connection.label": "Verbindung",
   "app.theme.tab_display.element.database.description": "Aktueller DB- / catalog-Name",
   "app.theme.tab_display.element.database.label": "Datenbank",
+  "app.theme.tab_display.element.group.description": "Name der Gruppe der Verbindung, leer wenn nicht zugeordnet",
+  "app.theme.tab_display.element.group.label": "Gruppe",
   "app.theme.tab_display.element.host.description": "Zusammenfassung der Zieladresse der Verbindung",
   "app.theme.tab_display.element.host.label": "Host/IP",
   "app.theme.tab_display.element.kind.description": "Typkennzeichen wie SQL / TABLE / VIEW",
diff --git a/shared/i18n/en-US.json b/shared/i18n/en-US.json
index 73ee8fcb..44c0dc40 100644
--- a/shared/i18n/en-US.json
+++ b/shared/i18n/en-US.json
@@ -3047,6 +3047,8 @@
   "app.theme.tab_display.element.connection.label": "Connection",
   "app.theme.tab_display.element.database.description": "Current DB / catalog name",
   "app.theme.tab_display.element.database.label": "Database",
+  "app.theme.tab_display.element.group.description": "Group name of the connection, empty when ungrouped",
+  "app.theme.tab_display.element.group.label": "Group",
   "app.theme.tab_display.element.host.description": "Connection target address summary",
   "app.theme.tab_display.element.host.label": "Host/IP",
   "app.theme.tab_display.element.kind.description": "Type labels such as SQL / TABLE / VIEW",
diff --git a/shared/i18n/ja-JP.json b/shared/i18n/ja-JP.json
index 812b3d72..e2a49a1c 100644
--- a/shared/i18n/ja-JP.json
+++ b/shared/i18n/ja-JP.json
@@ -3047,6 +3047,8 @@
   "app.theme.tab_display.element.connection.label": "接続名",
   "app.theme.tab_display.element.database.description": "現在の DB / catalog 名",
   "app.theme.tab_display.element.database.label": "データベース",
+  "app.theme.tab_display.element.group.description": "接続が属するグループ名。未グループの場合は空",
+  "app.theme.tab_display.element.group.label": "グループ",
   "app.theme.tab_display.element.host.description": "接続先アドレスの要約",
   "app.theme.tab_display.element.host.label": "Host/IP",
   "app.theme.tab_display.element.kind.description": "SQL / TABLE / VIEW などの種別ラベル",
diff --git a/shared/i18n/ru-RU.json b/shared/i18n/ru-RU.json
index 92490496..e7969b3f 100644
--- a/shared/i18n/ru-RU.json
+++ b/shared/i18n/ru-RU.json
@@ -3047,6 +3047,8 @@
   "app.theme.tab_display.element.connection.label": "Подключение",
   "app.theme.tab_display.element.database.description": "Текущее имя DB / catalog",
   "app.theme.tab_display.element.database.label": "База данных",
+  "app.theme.tab_display.element.group.description": "Имя группы подключения, пусто, если не в группе",
+  "app.theme.tab_display.element.group.label": "Группа",
   "app.theme.tab_display.element.host.description": "Краткий адрес целевого подключения",
   "app.theme.tab_display.element.host.label": "Host/IP",
   "app.theme.tab_display.element.kind.description": "Метки типов, например SQL / TABLE / VIEW",
diff --git a/shared/i18n/zh-CN.json b/shared/i18n/zh-CN.json
index ef772806..04c1ed12 100644
--- a/shared/i18n/zh-CN.json
+++ b/shared/i18n/zh-CN.json
@@ -3047,6 +3047,8 @@
   "app.theme.tab_display.element.connection.label": "连接名",
   "app.theme.tab_display.element.database.description": "当前 DB / catalog 名称",
   "app.theme.tab_display.element.database.label": "数据库",
+  "app.theme.tab_display.element.group.description": "连接所属的分组名称，未分组时为空",
+  "app.theme.tab_display.element.group.label": "分组",
   "app.theme.tab_display.element.host.description": "连接目标地址摘要",
   "app.theme.tab_display.element.host.label": "Host/IP",
   "app.theme.tab_display.element.kind.description": "SQL / TABLE / VIEW 等类型标签",
diff --git a/shared/i18n/zh-TW.json b/shared/i18n/zh-TW.json
index 6148336a..49f0555d 100644
--- a/shared/i18n/zh-TW.json
+++ b/shared/i18n/zh-TW.json
@@ -3047,6 +3047,8 @@
   "app.theme.tab_display.element.connection.label": "連線名稱",
   "app.theme.tab_display.element.database.description": "目前 DB / catalog 名稱",
   "app.theme.tab_display.element.database.label": "資料庫",
+  "app.theme.tab_display.element.group.description": "連線所屬的分組名稱，未分組時為空",
+  "app.theme.tab_display.element.group.label": "分組",
   "app.theme.tab_display.element.host.description": "連線目標位址摘要",
   "app.theme.tab_display.element.host.label": "Host/IP",
   "app.theme.tab_display.element.kind.description": "SQL / TABLE / VIEW 等類型標籤",