diff --git a/src/App.vue b/src/App.vue
index 8ff8cf933d..ffd89c8c50 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -1,7 +1,7 @@
 <script setup lang="ts">
 import { ref, computed, watch, onMounted, onUnmounted } from "vue";
 import { useI18n } from "vue-i18n";
-import { DatabaseZap, FilePlus2, Play, Loader2, X, Globe, Moon, Sun, Upload, Download, Plus, History, Server, Table2, Database, Search, ShieldCheck, Sparkles } from "lucide-vue-next";
+import { DatabaseZap, FilePlus2, Play, Loader2, X, Globe, Moon, Sun, Upload, Download, Plus, History, Server, Table2, Database, Search, ShieldCheck, Sparkles, Pin } from "lucide-vue-next";
 import { Splitpanes, Pane } from "splitpanes";
 import "splitpanes/dist/splitpanes.css";
 import { Button } from "@/components/ui/button";
@@ -591,14 +591,26 @@ async function setupFileDrop() {
             <div
               v-for="tab in queryStore.tabs"
               :key="tab.id"
-              class="flex items-center gap-1 px-3 h-full text-xs cursor-pointer border-r hover:bg-accent transition-colors whitespace-nowrap"
+              class="group flex min-w-0 items-center gap-1 px-3 h-full text-xs cursor-pointer border-r hover:bg-accent transition-colors whitespace-nowrap"
               :class="{ 'bg-background font-medium': tab.id === queryStore.activeTabId }"
               @click="queryStore.activeTabId = tab.id"
             >
               <span v-if="connectionColor(tab.connectionId)" class="h-4 w-1 rounded-full shrink-0" :style="{ backgroundColor: connectionColor(tab.connectionId) }" />
-              <span>{{ tabDisplayTitle(tab) }}</span>
+              <span class="min-w-0 truncate">{{ tabDisplayTitle(tab) }}</span>
+              <Tooltip>
+                <TooltipTrigger as-child>
+                  <button
+                    class="ml-1 rounded p-0.5 text-muted-foreground hover:bg-muted-foreground/20 hover:text-foreground focus:opacity-100"
+                    :class="tab.pinned ? 'opacity-100 text-primary' : 'opacity-0 group-hover:opacity-100'"
+                    @click.stop="queryStore.togglePinnedTab(tab.id)"
+                  >
+                    <Pin class="h-3 w-3" :class="{ 'fill-current': tab.pinned }" />
+                  </button>
+                </TooltipTrigger>
+                <TooltipContent>{{ tab.pinned ? t('contextMenu.unpin') : t('contextMenu.pin') }}</TooltipContent>
+              </Tooltip>
               <button
-                class="ml-1 rounded hover:bg-muted-foreground/20 p-0.5"
+                class="rounded hover:bg-muted-foreground/20 p-0.5"
                 @click.stop="queryStore.closeTab(tab.id)"
               >
                 <X class="h-3 w-3" />
diff --git a/src/components/sidebar/TreeItem.vue b/src/components/sidebar/TreeItem.vue
index 1c3224b199..974433deb2 100644
--- a/src/components/sidebar/TreeItem.vue
+++ b/src/components/sidebar/TreeItem.vue
@@ -5,6 +5,7 @@ import {
   Database, Table, Columns3, Eye, ChevronRight, ChevronDown,
   Loader2, FolderOpen, Trash2, TerminalSquare, RefreshCw,
   Copy, TableProperties, Key, Link, Zap, ListTree, Pencil, Plug, Unplug,
+  Pin,
 } from "lucide-vue-next";
 import {
   ContextMenu, ContextMenuContent, ContextMenuItem,
@@ -77,6 +78,15 @@ function getIconInfo(node: TreeNode): { icon: any; colorClass: string } | null {
 
 const leafTypes: Set<TreeNodeType> = new Set(["column", "index", "fkey", "trigger", "redis-db"]);
 const groupTypes: Set<TreeNodeType> = new Set(["group-columns", "group-indexes", "group-fkeys", "group-triggers"]);
+const pinnableTypes: Set<TreeNodeType> = new Set([
+  "database",
+  "schema",
+  "table",
+  "view",
+  "redis-db",
+  "mongo-db",
+  "mongo-collection",
+]);
 
 function isGroupLabel(node: TreeNode): boolean {
   return groupTypes.has(node.type);
@@ -220,6 +230,8 @@ function disconnectConnection() {
 }
 
 const canExpand = !leafTypes.has(props.node.type);
+const canPin = computed(() => pinnableTypes.has(props.node.type));
+const isPinned = computed(() => props.node.pinned || connectionStore.isTreeNodePinned(props.node.id));
 const paddingLeft = `${props.depth * 16 + 8}px`;
 const isConnected = computed(() =>
   props.node.type === "connection" && !!props.node.connectionId && connectionStore.connectedIds.has(props.node.connectionId)
@@ -249,6 +261,10 @@ const remainingCount = computed(() =>
   (props.node.children?.length ?? 0) - displayLimit.value
 );
 
+function togglePin() {
+  connectionStore.toggleTreeNodePin(props.node.id);
+}
+
 async function showMore() {
   if ((props.node.children?.length ?? 0) > displayLimit.value) {
     displayLimit.value += CHILDREN_PAGE_SIZE;
@@ -261,7 +277,7 @@ async function showMore() {
     <ContextMenuTrigger as-child>
       <div>
         <div
-          class="flex items-center gap-1.5 py-1 px-2 rounded-sm cursor-pointer hover:bg-accent transition-colors"
+          class="group flex min-w-0 items-center gap-1.5 py-1 px-2 rounded-sm cursor-pointer hover:bg-accent transition-colors"
           :style="{ paddingLeft }"
           @click="onClick"
         >
@@ -274,8 +290,17 @@ async function showMore() {
           <DatabaseIcon v-if="node.type === 'connection'" :db-type="connectionIconType(node.connectionId)" class="w-3.5 h-3.5 shrink-0" />
           <component v-else :is="getIconInfo(node)?.icon || Database" class="w-3.5 h-3.5 shrink-0" :class="getIconInfo(node)?.colorClass" />
           <span v-if="node.type === 'connection' && connectionColor" class="h-3 w-1.5 rounded-full shrink-0" :style="{ backgroundColor: connectionColor }" />
-          <span class="truncate">{{ isGroupLabel(node) ? t(node.label) : node.label }}</span>
+          <span class="min-w-0 flex-1 truncate">{{ isGroupLabel(node) ? t(node.label) : node.label }}</span>
           <span v-if="node.type === 'connection' && node.connectionId && connectionStore.connectedIds.has(node.connectionId)" class="w-1.5 h-1.5 rounded-full bg-green-500 shrink-0" />
+          <button
+            v-if="canPin"
+            class="rounded p-0.5 text-muted-foreground hover:bg-muted-foreground/15 hover:text-foreground focus:opacity-100"
+            :class="isPinned ? 'opacity-100 text-primary' : 'opacity-0 group-hover:opacity-100'"
+            :title="isPinned ? t('contextMenu.unpin') : t('contextMenu.pin')"
+            @click.stop="togglePin"
+          >
+            <Pin class="w-3 h-3" :class="{ 'fill-current': isPinned }" />
+          </button>
         </div>
         <template v-if="node.isExpanded && node.children">
           <TreeItem v-for="child in visibleChildren" :key="child.id" :node="child" :depth="depth + 1" />
@@ -293,6 +318,12 @@ async function showMore() {
     </ContextMenuTrigger>
 
     <ContextMenuContent class="w-48">
+      <ContextMenuItem v-if="canPin" @click="togglePin">
+        <Pin class="w-3.5 h-3.5 mr-2" :class="{ 'fill-current': isPinned }" />
+        {{ isPinned ? t('contextMenu.unpin') : t('contextMenu.pin') }}
+      </ContextMenuItem>
+      <ContextMenuSeparator v-if="canPin" />
+
       <template v-if="node.type === 'connection'">
         <ContextMenuItem v-if="!isConnected" @click="toggle">
           <Plug class="w-3.5 h-3.5 mr-2" /> {{ t('contextMenu.openConnection') }}
diff --git a/src/i18n/locales/en.ts b/src/i18n/locales/en.ts
index 8f7d75aed1..8e4016ab83 100644
--- a/src/i18n/locales/en.ts
+++ b/src/i18n/locales/en.ts
@@ -153,6 +153,8 @@ export default {
     newQuery: "New Query",
     viewData: "View Data",
     refreshChildren: "Refresh",
+    pin: "Pin",
+    unpin: "Unpin",
     copyName: "Copy Name",
   },
   tree: {
diff --git a/src/i18n/locales/zh-CN.ts b/src/i18n/locales/zh-CN.ts
index 6d56ca9062..fc602c05a6 100644
--- a/src/i18n/locales/zh-CN.ts
+++ b/src/i18n/locales/zh-CN.ts
@@ -151,6 +151,8 @@ export default {
     newQuery: "新建查询",
     viewData: "查看数据",
     refreshChildren: "刷新",
+    pin: "置顶",
+    unpin: "取消置顶",
     copyName: "复制名称",
   },
   tree: {
diff --git a/src/lib/pinnedItems.ts b/src/lib/pinnedItems.ts
new file mode 100644
index 0000000000..62f7ab2ae6
--- /dev/null
+++ b/src/lib/pinnedItems.ts
@@ -0,0 +1,11 @@
+export function orderPinnedFirst<T>(items: T[], isPinned: (item: T) => boolean): T[] {
+  const pinned: T[] = [];
+  const unpinned: T[] = [];
+
+  for (const item of items) {
+    if (isPinned(item)) pinned.push(item);
+    else unpinned.push(item);
+  }
+
+  return [...pinned, ...unpinned];
+}
diff --git a/src/stores/connectionStore.ts b/src/stores/connectionStore.ts
index 63ded16762..fc97557a08 100644
--- a/src/stores/connectionStore.ts
+++ b/src/stores/connectionStore.ts
@@ -1,12 +1,16 @@
 import { defineStore } from "pinia";
 import { ref } from "vue";
 import type { ConnectionConfig, TreeNode } from "@/types/database";
+import { orderPinnedFirst } from "@/lib/pinnedItems";
 import * as api from "@/lib/tauri";
 
+const PINNED_TREE_NODES_STORAGE_KEY = "dbx-pinned-tree-nodes";
+
 export const useConnectionStore = defineStore("connection", () => {
   const connections = ref<ConnectionConfig[]>([]);
   const activeConnectionId = ref<string | null>(null);
   const treeNodes = ref<TreeNode[]>([]);
+  const pinnedTreeNodeIds = ref<Set<string>>(loadPinnedTreeNodeIds());
   const connectedIds = ref<Set<string>>(new Set());
   const editingConnectionId = ref<string | null>(null);
 
@@ -42,6 +46,64 @@ export const useConnectionStore = defineStore("connection", () => {
     };
   }
 
+  function loadPinnedTreeNodeIds(): Set<string> {
+    try {
+      if (typeof localStorage === "undefined") return new Set();
+      const saved = localStorage.getItem(PINNED_TREE_NODES_STORAGE_KEY);
+      const ids = saved ? JSON.parse(saved) : [];
+      return new Set(Array.isArray(ids) ? ids.filter((id) => typeof id === "string") : []);
+    } catch {
+      return new Set();
+    }
+  }
+
+  function persistPinnedTreeNodeIds() {
+    if (typeof localStorage === "undefined") return;
+    localStorage.setItem(PINNED_TREE_NODES_STORAGE_KEY, JSON.stringify([...pinnedTreeNodeIds.value]));
+  }
+
+  function isTreeNodePinned(id: string): boolean {
+    return pinnedTreeNodeIds.value.has(id);
+  }
+
+  function pinTreeNode(node: TreeNode): TreeNode {
+    node.pinned = isTreeNodePinned(node.id);
+    return node;
+  }
+
+  function setChildren(parent: TreeNode, children: TreeNode[]) {
+    parent.children = orderPinnedFirst(children.map(pinTreeNode), (node) => !!node.pinned);
+  }
+
+  function findParentNode(nodes: TreeNode[], id: string, parent: TreeNode | null = null): TreeNode | null {
+    for (const node of nodes) {
+      if (node.id === id) return parent;
+      if (node.children) {
+        const found = findParentNode(node.children, id, node);
+        if (found) return found;
+      }
+    }
+    return null;
+  }
+
+  function toggleTreeNodePin(id: string) {
+    const next = new Set(pinnedTreeNodeIds.value);
+    if (next.has(id)) next.delete(id);
+    else next.add(id);
+    pinnedTreeNodeIds.value = next;
+    persistPinnedTreeNodeIds();
+
+    const node = findNode(treeNodes.value, id);
+    if (node) node.pinned = next.has(id);
+
+    const parent = findParentNode(treeNodes.value, id);
+    if (parent?.children) {
+      parent.children = orderPinnedFirst(parent.children, (child) => !!child.pinned);
+    } else {
+      treeNodes.value = orderPinnedFirst(treeNodes.value, (child) => !!child.pinned);
+    }
+  }
+
   function addConnection(config: ConnectionConfig) {
     connections.value.push(normalizeConnection(config));
     persistConnections();
@@ -123,7 +185,7 @@ export const useConnectionStore = defineStore("connection", () => {
     try {
       await ensureConnected(connectionId);
       const databases = await api.listDatabases(connectionId);
-      node.children = databases.map((db) => ({
+      setChildren(node, databases.map((db) => ({
         id: `${connectionId}:${db.name}`,
         label: db.name,
         type: "database" as const,
@@ -131,7 +193,7 @@ export const useConnectionStore = defineStore("connection", () => {
         database: db.name,
         isExpanded: false,
         children: [],
-      }));
+      })));
       node.isExpanded = true;
     } finally {
       node.isLoading = false;
@@ -146,7 +208,7 @@ export const useConnectionStore = defineStore("connection", () => {
     try {
       await ensureConnected(connectionId);
       const dbs = await api.redisListDatabases(connectionId);
-      node.children = dbs.map((db) => ({
+      setChildren(node, dbs.map((db) => ({
         id: `${connectionId}:db${db}`,
         label: `db${db}`,
         type: "redis-db" as const,
@@ -154,7 +216,7 @@ export const useConnectionStore = defineStore("connection", () => {
         database: String(db),
         isExpanded: false,
         children: [],
-      }));
+      })));
       node.isExpanded = true;
     } finally {
       node.isLoading = false;
@@ -169,7 +231,7 @@ export const useConnectionStore = defineStore("connection", () => {
     try {
       await ensureConnected(connectionId);
       const dbs = await api.mongoListDatabases(connectionId);
-      node.children = dbs.map((db) => ({
+      setChildren(node, dbs.map((db) => ({
         id: `${connectionId}:${db}`,
         label: db,
         type: "mongo-db" as const,
@@ -177,7 +239,7 @@ export const useConnectionStore = defineStore("connection", () => {
         database: db,
         isExpanded: false,
         children: [],
-      }));
+      })));
       node.isExpanded = true;
     } finally {
       node.isLoading = false;
@@ -192,14 +254,14 @@ export const useConnectionStore = defineStore("connection", () => {
     node.isLoading = true;
     try {
       const collections = await api.mongoListCollections(connectionId, database);
-      node.children = collections.map((col) => ({
+      setChildren(node, collections.map((col) => ({
         id: `${nodeId}:${col}`,
         label: col,
         type: "mongo-collection" as const,
         connectionId,
         database,
         isExpanded: false,
-      }));
+      })));
       node.isExpanded = true;
     } finally {
       node.isLoading = false;
@@ -214,7 +276,7 @@ export const useConnectionStore = defineStore("connection", () => {
     node.isLoading = true;
     try {
       const schemas = await api.listSchemas(connectionId, database);
-      node.children = schemas.map((s) => ({
+      setChildren(node, schemas.map((s) => ({
         id: `${connectionId}:${database}:${s}`,
         label: s,
         type: "schema" as const,
@@ -223,7 +285,7 @@ export const useConnectionStore = defineStore("connection", () => {
         schema: s,
         isExpanded: false,
         children: [],
-      }));
+      })));
       node.isExpanded = true;
     } finally {
       node.isLoading = false;
@@ -241,7 +303,7 @@ export const useConnectionStore = defineStore("connection", () => {
     try {
       const querySchema = schema || database;
       const tables = await api.listTables(connectionId, database, querySchema);
-      node.children = tables.map((t) => ({
+      setChildren(node, tables.map((t) => ({
         id: `${nodeId}:${t.name}`,
         label: t.name,
         type: (t.table_type === "VIEW" ? "view" : "table") as "view" | "table",
@@ -250,7 +312,7 @@ export const useConnectionStore = defineStore("connection", () => {
         schema,
         isExpanded: false,
         children: [],
-      }));
+      })));
       node.isExpanded = true;
     } finally {
       node.isLoading = false;
@@ -264,12 +326,12 @@ export const useConnectionStore = defineStore("connection", () => {
     const node = findNode(treeNodes.value, parentId);
     if (!node) return;
 
-    node.children = [
+    setChildren(node, [
       { id: `${parentId}:__columns`, label: "tree.columns", type: "group-columns", connectionId, database, schema, tableName: table, isExpanded: false, children: [] },
       { id: `${parentId}:__indexes`, label: "tree.indexes", type: "group-indexes", connectionId, database, schema, tableName: table, isExpanded: false, children: [] },
       { id: `${parentId}:__fkeys`, label: "tree.foreignKeys", type: "group-fkeys", connectionId, database, schema, tableName: table, isExpanded: false, children: [] },
       { id: `${parentId}:__triggers`, label: "tree.triggers", type: "group-triggers", connectionId, database, schema, tableName: table, isExpanded: false, children: [] },
-    ];
+    ]);
     node.isExpanded = true;
   }
 
@@ -284,7 +346,7 @@ export const useConnectionStore = defineStore("connection", () => {
     try {
       const querySchema = schema || database;
       const columns = await api.getColumns(connectionId, database, querySchema, table);
-      node.children = columns.map((col) => ({
+      setChildren(node, columns.map((col) => ({
         id: `${parentId}:${col.name}`,
         label: `${col.name} (${col.data_type})`,
         type: "column" as const,
@@ -292,7 +354,7 @@ export const useConnectionStore = defineStore("connection", () => {
         database,
         schema,
         meta: col,
-      }));
+      })));
       node.isExpanded = true;
     } finally {
       node.isLoading = false;
@@ -310,7 +372,7 @@ export const useConnectionStore = defineStore("connection", () => {
     try {
       const querySchema = schema || database;
       const indexes = await api.listIndexes(connectionId, database, querySchema, table);
-      node.children = indexes.map((idx) => ({
+      setChildren(node, indexes.map((idx) => ({
         id: `${parentId}:${idx.name}`,
         label: `${idx.name} (${idx.columns.join(", ")})`,
         type: "index" as const,
@@ -318,7 +380,7 @@ export const useConnectionStore = defineStore("connection", () => {
         database,
         schema,
         meta: idx,
-      }));
+      })));
       node.isExpanded = true;
     } finally {
       node.isLoading = false;
@@ -336,7 +398,7 @@ export const useConnectionStore = defineStore("connection", () => {
     try {
       const querySchema = schema || database;
       const fkeys = await api.listForeignKeys(connectionId, database, querySchema, table);
-      node.children = fkeys.map((fk) => ({
+      setChildren(node, fkeys.map((fk) => ({
         id: `${parentId}:${fk.name}`,
         label: `${fk.column} → ${fk.ref_table}.${fk.ref_column}`,
         type: "fkey" as const,
@@ -344,7 +406,7 @@ export const useConnectionStore = defineStore("connection", () => {
         database,
         schema,
         meta: fk,
-      }));
+      })));
       node.isExpanded = true;
     } finally {
       node.isLoading = false;
@@ -362,7 +424,7 @@ export const useConnectionStore = defineStore("connection", () => {
     try {
       const querySchema = schema || database;
       const triggers = await api.listTriggers(connectionId, database, querySchema, table);
-      node.children = triggers.map((tr) => ({
+      setChildren(node, triggers.map((tr) => ({
         id: `${parentId}:${tr.name}`,
         label: `${tr.name} (${tr.timing} ${tr.event})`,
         type: "trigger" as const,
@@ -370,7 +432,7 @@ export const useConnectionStore = defineStore("connection", () => {
         database,
         schema,
         meta: tr,
-      }));
+      })));
       node.isExpanded = true;
     } finally {
       node.isLoading = false;
@@ -444,6 +506,8 @@ export const useConnectionStore = defineStore("connection", () => {
     treeNodes,
     connectedIds,
     getConfig,
+    isTreeNodePinned,
+    toggleTreeNodePin,
     addConnection,
     updateConnection,
     removeConnection,
diff --git a/src/stores/queryStore.ts b/src/stores/queryStore.ts
index 32d1ea30d4..91e35d0eba 100644
--- a/src/stores/queryStore.ts
+++ b/src/stores/queryStore.ts
@@ -1,6 +1,7 @@
 import { defineStore } from "pinia";
 import { ref } from "vue";
 import type { QueryTab } from "@/types/database";
+import { orderPinnedFirst } from "@/lib/pinnedItems";
 import * as api from "@/lib/tauri";
 
 export const useQueryStore = defineStore("query", () => {
@@ -50,6 +51,13 @@ export const useQueryStore = defineStore("query", () => {
     if (tab) tab.sql = sql;
   }
 
+  function togglePinnedTab(id: string) {
+    const tab = tabs.value.find((t) => t.id === id);
+    if (!tab) return;
+    tab.pinned = !tab.pinned;
+    tabs.value = orderPinnedFirst(tabs.value, (item) => !!item.pinned);
+  }
+
   function updateDatabase(id: string, database: string) {
     const tab = tabs.value.find((t) => t.id === id);
     if (!tab || tab.database === database) return;
@@ -116,6 +124,7 @@ export const useQueryStore = defineStore("query", () => {
     createTab,
     closeTab,
     updateSql,
+    togglePinnedTab,
     updateDatabase,
     updateConnection,
     setTableMeta,
diff --git a/src/types/database.ts b/src/types/database.ts
index eae9b2db7b..4ffc57ad44 100644
--- a/src/types/database.ts
+++ b/src/types/database.ts
@@ -82,6 +82,7 @@ export interface TreeNode {
   children?: TreeNode[];
   isLoading?: boolean;
   isExpanded?: boolean;
+  pinned?: boolean;
   connectionId?: string;
   database?: string;
   schema?: string;
@@ -96,6 +97,7 @@ export interface QueryTab {
   database: string;
   sql: string;
   lastExecutedSql?: string;
+  pinned?: boolean;
   result?: QueryResult;
   isExecuting: boolean;
   mode: "data" | "query" | "redis" | "mongo";
diff --git a/tests/pinnedItems.test.ts b/tests/pinnedItems.test.ts
new file mode 100644
index 0000000000..f010daa789
--- /dev/null
+++ b/tests/pinnedItems.test.ts
@@ -0,0 +1,18 @@
+import { strict as assert } from "node:assert";
+import test from "node:test";
+import { orderPinnedFirst } from "../src/lib/pinnedItems.js";
+
+test("orders pinned items before unpinned items without changing relative order", () => {
+  const items = [
+    { id: "a" },
+    { id: "b", pinned: true },
+    { id: "c" },
+    { id: "d", pinned: true },
+    { id: "e" },
+  ];
+
+  const ordered = orderPinnedFirst(items, (item) => !!item.pinned);
+
+  assert.deepEqual(ordered.map((item) => item.id), ["b", "d", "a", "c", "e"]);
+  assert.deepEqual(items.map((item) => item.id), ["a", "b", "c", "d", "e"]);
+});