diff --git a/react/src/api/tag.api.ts b/react/src/api/tag.api.ts
new file mode 100644
index 0000000..040f2c8
--- /dev/null
+++ b/react/src/api/tag.api.ts
@@ -0,0 +1,40 @@
+import { apiClient } from "./client";
+import type { ApiResponse } from "@/types/api";
+import type {
+  TagListRequest,
+  TagListResponse,
+  TagResponse,
+  CreateTagRequest,
+  UpdateTagRequest,
+  DeleteTagRequest,
+} from "@/features/tag/types";
+
+/** 태그 목록 조회 (serviceCode 생략 시 전체 서비스) */
+export function fetchTagList(data: TagListRequest, serviceCode?: string) {
+  return apiClient.post<ApiResponse<TagListResponse>>(
+    "/v1/in/tag/list",
+    data,
+    serviceCode ? { headers: { "X-Service-Code": serviceCode } } : undefined,
+  );
+}
+
+/** 태그 생성 */
+export function createTag(data: CreateTagRequest, serviceCode: string) {
+  return apiClient.post<ApiResponse<TagResponse>>("/v1/in/tag/create", data, {
+    headers: { "X-Service-Code": serviceCode },
+  });
+}
+
+/** 태그 수정 */
+export function updateTag(data: UpdateTagRequest, serviceCode: string) {
+  return apiClient.post<ApiResponse<TagResponse>>("/v1/in/tag/update", data, {
+    headers: { "X-Service-Code": serviceCode },
+  });
+}
+
+/** 태그 삭제 */
+export function deleteTag(data: DeleteTagRequest, serviceCode: string) {
+  return apiClient.post<ApiResponse<null>>("/v1/in/tag/delete", data, {
+    headers: { "X-Service-Code": serviceCode },
+  });
+}
diff --git a/react/src/features/service/types.ts b/react/src/features/service/types.ts
index 1af9996..7a06dce 100644
--- a/react/src/features/service/types.ts
+++ b/react/src/features/service/types.ts
@@ -26,6 +26,7 @@ export interface PlatformCredentialSummary {
 
 // 서비스 목록 항목
 export interface ServiceSummary {
+  serviceId: number;
   serviceCode: string;
   serviceName: string;
   serviceIcon?: string;
diff --git a/react/src/features/tag/components/TagAddModal.tsx b/react/src/features/tag/components/TagAddModal.tsx
index 4bd9200..468ef0d 100644
--- a/react/src/features/tag/components/TagAddModal.tsx
+++ b/react/src/features/tag/components/TagAddModal.tsx
@@ -1,14 +1,14 @@
 import { useState, useRef, useEffect } from "react";
 import useShake from "@/hooks/useShake";
-import { SERVICE_OPTIONS } from "../types";
 
 interface TagAddModalProps {
   open: boolean;
   onClose: () => void;
   onSave: (data: { name: string; service: string; description: string }) => void;
+  serviceOptions: string[];
 }
 
-export default function TagAddModal({ open, onClose, onSave }: TagAddModalProps) {
+export default function TagAddModal({ open, onClose, onSave, serviceOptions }: TagAddModalProps) {
   const { triggerShake, cls } = useShake();
 
   const [name, setName] = useState("");
@@ -107,9 +107,10 @@ export default function TagAddModal({ open, onClose, onSave }: TagAddModalProps)
                 type="text"
                 value={name}
                 onChange={(e) => {
-                  setName(e.target.value);
+                  if (e.target.value.length <= 50) setName(e.target.value);
                   if (e.target.value.trim()) setNameError(false);
                 }}
+                maxLength={50}
                 placeholder="태그 이름을 입력하세요"
                 className={`w-full h-[38px] px-3 border rounded-lg text-sm focus:ring-2 focus:ring-primary/20 focus:border-primary outline-none transition-all ${
                   nameError
@@ -154,7 +155,7 @@ export default function TagAddModal({ open, onClose, onSave }: TagAddModalProps)
                 </button>
                 {serviceOpen && (
                   <ul className="absolute left-0 top-full mt-1 w-full bg-white border border-gray-200 rounded-lg shadow-lg z-50 py-1 overflow-hidden">
-                    {SERVICE_OPTIONS.map((opt) => (
+                    {serviceOptions.map((opt) => (
                       <li
                         key={opt}
                         onClick={() => {
@@ -192,11 +193,17 @@ export default function TagAddModal({ open, onClose, onSave }: TagAddModalProps)
               </label>
               <textarea
                 value={description}
-                onChange={(e) => setDescription(e.target.value)}
+                onChange={(e) => {
+                  if (e.target.value.length <= 200) setDescription(e.target.value);
+                }}
+                maxLength={200}
                 placeholder="태그 설명을 입력하세요"
                 rows={3}
                 className="w-full px-3 py-2 border border-gray-300 rounded-lg text-sm resize-none focus:ring-2 focus:ring-primary/20 focus:border-primary outline-none transition-all"
               />
+              <div className="text-right text-xs text-gray-400 mt-1">
+                {description.length}/200
+              </div>
             </div>
 
             {/* 안내 박스 */}
diff --git a/react/src/features/tag/components/TagCard.tsx b/react/src/features/tag/components/TagCard.tsx
index 599835f..3ad55fb 100644
--- a/react/src/features/tag/components/TagCard.tsx
+++ b/react/src/features/tag/components/TagCard.tsx
@@ -1,4 +1,5 @@
 import { useState, useRef, useEffect } from "react";
+import { toast } from "sonner";
 import { formatNumber } from "@/utils/format";
 import type { Tag } from "../types";
 
@@ -129,11 +130,24 @@ export default function TagCard({ tag, onEdit, onDelete }: TagCardProps) {
             </span>
           </div>
         ) : (
-          <div className="flex items-center gap-2 mb-1">
+          <div className="flex items-center justify-between gap-2 mb-1">
             <h3 className="text-base font-bold text-[#0f172a]">{tag.name}</h3>
-            <span className="text-xs font-medium text-gray-400">
-              #{tag.tagNumber}
-            </span>
+            <button
+              onClick={() => {
+                navigator.clipboard.writeText(tag.tagCode);
+                toast.success("태그 코드가 복사되었습니다.");
+              }}
+              className="flex items-center gap-1 text-xs font-medium text-gray-400 hover:text-primary bg-gray-50 hover:bg-blue-50 px-2 py-0.5 rounded transition-colors cursor-pointer flex-shrink-0"
+              title="클릭하여 복사"
+            >
+              <span
+                className="material-symbols-outlined flex-shrink-0"
+                style={{ fontSize: "12px" }}
+              >
+                content_copy
+              </span>
+              {tag.tagCode}
+            </button>
           </div>
         )}
 
@@ -160,10 +174,16 @@ export default function TagCard({ tag, onEdit, onDelete }: TagCardProps) {
               <textarea
                 ref={textareaRef}
                 value={editDesc}
-                onChange={(e) => setEditDesc(e.target.value)}
+                onChange={(e) => {
+                  if (e.target.value.length <= 200) setEditDesc(e.target.value);
+                }}
+                maxLength={200}
                 rows={3}
                 className="w-full px-3 py-2 border border-gray-300 rounded-lg text-sm resize-none focus:ring-2 focus:ring-primary/20 focus:border-primary outline-none transition-all flex-grow"
               />
+              <div className="text-right text-xs text-gray-400 mt-1">
+                {editDesc.length}/200
+              </div>
             </div>
             <div className="pt-4 mt-4 border-t border-gray-100 flex gap-2">
               <button
diff --git a/react/src/features/tag/pages/TagManagePage.tsx b/react/src/features/tag/pages/TagManagePage.tsx
index 8e206c0..c36b29e 100644
--- a/react/src/features/tag/pages/TagManagePage.tsx
+++ b/react/src/features/tag/pages/TagManagePage.tsx
@@ -1,4 +1,4 @@
-import { useState, useMemo } from "react";
+import { useState, useCallback, useEffect } from "react";
 import { toast } from "sonner";
 import PageHeader from "@/components/common/PageHeader";
 import EmptyState from "@/components/common/EmptyState";
@@ -6,82 +6,211 @@ import Pagination from "@/components/common/Pagination";
 import TagCard from "../components/TagCard";
 import TagAddModal from "../components/TagAddModal";
 import TagDeleteModal from "../components/TagDeleteModal";
-import { MOCK_TAGS } from "../types";
-import type { Tag } from "../types";
+import { fetchTagList, createTag, updateTag, deleteTag } from "@/api/tag.api";
+import { fetchServices } from "@/api/service.api";
+import type { Tag, TagListItem } from "../types";
+
+const PAGE_SIZE = 9;
+
+/** 서비스 정보 */
+interface ServiceInfo {
+  serviceId: number;
+  serviceName: string;
+  serviceCode: string;
+}
+
+/** API 응답 → 뷰모델 변환 */
+function mapTagItem(item: TagListItem): Tag {
+  return {
+    id: item.tag_id,
+    name: item.tag_name ?? "",
+    service: item.service_name ?? "",
+    tagCode: item.tag_code ?? `#${item.tag_index}`,
+    tagNumber: item.tag_index,
+    deviceCount: item.device_count,
+    description: item.description ?? "",
+  };
+}
 
 export default function TagManagePage() {
-  // 태그 데이터 (로컬 state)
-  const [tags, setTags] = useState<Tag[]>(MOCK_TAGS);
-  const [nextId, setNextId] = useState(MOCK_TAGS.length + 1);
+  // 태그 데이터
+  const [tags, setTags] = useState<Tag[]>([]);
+  const [totalPages, setTotalPages] = useState(1);
+  const [totalItems, setTotalItems] = useState(0);
+  const [loading, setLoading] = useState(false);
+
+  // 서비스 목록
+  const [serviceList, setServiceList] = useState<ServiceInfo[]>([]);
+
+  // 탭별 건수
+  const [tabCounts, setTabCounts] = useState<Record<string, number>>({});
 
   // 탭 · 페이지 상태
   const [activeTab, setActiveTab] = useState("전체");
   const [currentPage, setCurrentPage] = useState(1);
-  const PAGE_SIZE = 9;
 
   // 모달 상태
   const [addModalOpen, setAddModalOpen] = useState(false);
   const [deleteTarget, setDeleteTarget] = useState<Tag | null>(null);
 
-  // 서비스 목록 추출
-  const services = useMemo(() => {
-    const set = new Set<string>();
-    for (const tag of tags) set.add(tag.service);
-    return [...set];
-  }, [tags]);
+  /** 서비스 목록 로드 (초기 1회) */
+  const loadServices = useCallback(async () => {
+    try {
+      const res = await fetchServices({ page: 1, pageSize: 100 });
+      const items = res.data.data.items ?? [];
+      setServiceList(
+        items.map((svc) => ({
+          serviceId: svc.serviceId,
+          serviceName: svc.serviceName,
+          serviceCode: svc.serviceCode,
+        })),
+      );
+    } catch {
+      setServiceList([]);
+    }
+  }, []);
 
-  // 활성 탭에 따른 필터링
-  const filtered = useMemo(() => {
-    if (activeTab === "전체") return tags;
-    return tags.filter((tag) => tag.service === activeTab);
-  }, [tags, activeTab]);
+  /** 탭별 건수 계산 (전체 조회 1회) */
+  const loadTabCounts = useCallback(async () => {
+    try {
+      const res = await fetchTagList({ page: 1, size: 100 });
+      const items = res.data.data.items ?? [];
+      const counts: Record<string, number> = {};
+      let total = 0;
+      for (const item of items) {
+        counts[item.service_name] = (counts[item.service_name] ?? 0) + 1;
+        total++;
+      }
+      counts["전체"] = total;
+      setTabCounts(counts);
+    } catch {
+      setTabCounts({});
+    }
+  }, []);
 
-  // 페이지네이션
-  const totalPages = Math.ceil(filtered.length / PAGE_SIZE);
-  const paged = useMemo(() => {
-    const start = (currentPage - 1) * PAGE_SIZE;
-    return filtered.slice(start, start + PAGE_SIZE);
-  }, [filtered, currentPage]);
+  /** 태그 목록 로드 */
+  const loadData = useCallback(
+    async (page: number, tab: string) => {
+      setLoading(true);
+      try {
+        const svc = tab !== "전체"
+          ? serviceList.find((s) => s.serviceName === tab)
+          : undefined;
+
+        const res = await fetchTagList(
+          { page, size: PAGE_SIZE },
+          svc?.serviceCode,
+        );
+
+        const data = res.data.data;
+        setTags((data.items ?? []).map(mapTagItem));
+        setTotalItems(data.pagination?.total_count ?? 0);
+        setTotalPages(data.pagination?.total_pages ?? 1);
+      } catch {
+        setTags([]);
+        setTotalItems(0);
+        setTotalPages(1);
+      } finally {
+        setLoading(false);
+      }
+    },
+    [serviceList],
+  );
+
+  // 초기 로드
+  useEffect(() => {
+    loadServices();
+  }, [loadServices]);
+
+  // 서비스 목록 준비 후 데이터 + 탭건수 로드
+  useEffect(() => {
+    if (serviceList.length === 0) return;
+    loadData(1, activeTab);
+    loadTabCounts();
+  }, [serviceList]); // eslint-disable-line react-hooks/exhaustive-deps
+
+  // 탭 변경
+  const handleTabChange = (tab: string) => {
+    setActiveTab(tab);
+    setCurrentPage(1);
+    loadData(1, tab);
+  };
+
+  // 페이지 변경
+  const handlePageChange = (page: number) => {
+    setCurrentPage(page);
+    loadData(page, activeTab);
+  };
+
+  /** 데이터 리프레시 */
+  const refresh = () => {
+    loadData(currentPage, activeTab);
+    loadTabCounts();
+  };
 
   // 태그 추가
-  const handleAdd = (data: {
+  const handleAdd = async (data: {
     name: string;
     service: string;
     description: string;
   }) => {
-    // 해당 서비스의 기존 최대 순번 + 1
-    const maxNum = tags
-      .filter((t) => t.service === data.service)
-      .reduce((max, t) => Math.max(max, t.tagNumber), 0);
-    const newTag: Tag = {
-      id: nextId,
-      name: data.name,
-      service: data.service,
-      tagNumber: maxNum + 1,
-      deviceCount: 0,
-      description: data.description,
-    };
-    setTags((prev) => [...prev, newTag]);
-    setNextId((prev) => prev + 1);
-    toast.success("태그가 등록되었습니다.");
+    const svc = serviceList.find((s) => s.serviceName === data.service);
+    if (!svc) {
+      toast.error("서비스를 찾을 수 없습니다.");
+      return;
+    }
+    try {
+      await createTag({
+        service_id: svc.serviceId,
+        tag_name: data.name,
+        description: data.description || undefined,
+      }, svc.serviceCode);
+      toast.success("태그가 등록되었습니다.");
+      refresh();
+    } catch {
+      toast.error("태그 등록에 실패했습니다.");
+    }
   };
 
   // 태그 수정 (설명만)
-  const handleEdit = (id: number, description: string) => {
-    setTags((prev) =>
-      prev.map((tag) => (tag.id === id ? { ...tag, description } : tag))
-    );
-    toast.success("태그가 수정되었습니다.");
+  const handleEdit = async (id: number, description: string) => {
+    // 해당 태그의 서비스코드 찾기
+    const tag = tags.find((t) => t.id === id);
+    const svc = serviceList.find((s) => s.serviceName === tag?.service);
+    if (!svc) {
+      toast.error("서비스를 찾을 수 없습니다.");
+      return;
+    }
+    try {
+      await updateTag({ tag_id: id, tag_code: tag!.tagCode, description }, svc.serviceCode);
+      toast.success("태그가 수정되었습니다.");
+      refresh();
+    } catch {
+      toast.error("태그 수정에 실패했습니다.");
+    }
   };
 
   // 태그 삭제
-  const handleDeleteConfirm = () => {
+  const handleDeleteConfirm = async () => {
     if (!deleteTarget) return;
-    setTags((prev) => prev.filter((tag) => tag.id !== deleteTarget.id));
-    setDeleteTarget(null);
-    toast.success("태그가 삭제되었습니다.");
+    const svc = serviceList.find((s) => s.serviceName === deleteTarget.service);
+    if (!svc) {
+      toast.error("서비스를 찾을 수 없습니다.");
+      return;
+    }
+    try {
+      await deleteTag({ tag_id: deleteTarget.id, tag_code: deleteTarget.tagCode }, svc.serviceCode);
+      setDeleteTarget(null);
+      toast.success("태그가 삭제되었습니다.");
+      refresh();
+    } catch {
+      toast.error("태그 삭제에 실패했습니다.");
+    }
   };
 
+  const totalCount = tabCounts["전체"] ?? 0;
+  const serviceNames = serviceList.map((s) => s.serviceName);
+
   return (
     <div>
       <PageHeader
@@ -98,20 +227,22 @@ export default function TagManagePage() {
         }
       />
 
-      {/* 서비스 탭 */}
-      {tags.length > 0 ? (
+      {!loading && totalCount === 0 && serviceList.length > 0 ? (
+        <EmptyState
+          icon="label_off"
+          message="등록된 태그가 없습니다"
+          description="태그 추가 버튼을 눌러 새로운 태그를 등록하세요."
+        />
+      ) : (
         <>
           {/* 서비스 탭 */}
           <div className="flex gap-1 border-b border-gray-200 overflow-x-auto scrollbar-hide">
-            {["전체", ...services].map((tab) => {
-              const count =
-                tab === "전체"
-                  ? tags.length
-                  : tags.filter((t) => t.service === tab).length;
+            {["전체", ...serviceNames].map((tab) => {
+              const count = tabCounts[tab] ?? 0;
               return (
                 <button
                   key={tab}
-                  onClick={() => { setActiveTab(tab); setCurrentPage(1); }}
+                  onClick={() => handleTabChange(tab)}
                   className={`px-4 py-2.5 text-sm font-medium transition-colors relative whitespace-nowrap flex-shrink-0 ${
                     activeTab === tab
                       ? "text-primary"
@@ -134,9 +265,9 @@ export default function TagManagePage() {
               <Pagination
                 currentPage={currentPage}
                 totalPages={totalPages}
-                totalItems={filtered.length}
+                totalItems={totalItems}
                 pageSize={PAGE_SIZE}
-                onPageChange={setCurrentPage}
+                onPageChange={handlePageChange}
               />
             </div>
           )}
@@ -144,7 +275,7 @@ export default function TagManagePage() {
 
           {/* 카드 그리드 */}
           <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
-            {paged.map((tag) => (
+            {tags.map((tag) => (
               <TagCard
                 key={tag.id}
                 tag={tag}
@@ -154,12 +285,6 @@ export default function TagManagePage() {
             ))}
           </div>
         </>
-      ) : (
-        <EmptyState
-          icon="label_off"
-          message="등록된 태그가 없습니다"
-          description="태그 추가 버튼을 눌러 새로운 태그를 등록하세요."
-        />
       )}
 
       {/* 태그 추가 모달 */}
@@ -167,6 +292,7 @@ export default function TagManagePage() {
         open={addModalOpen}
         onClose={() => setAddModalOpen(false)}
         onSave={handleAdd}
+        serviceOptions={serviceNames}
       />
 
       {/* 태그 삭제 모달 */}
diff --git a/react/src/features/tag/types.ts b/react/src/features/tag/types.ts
index 59d3c20..b98b15b 100644
--- a/react/src/features/tag/types.ts
+++ b/react/src/features/tag/types.ts
@@ -1,114 +1,81 @@
-// Tag 인터페이스
+// Tag 뷰모델 (TagCard/TagDeleteModal이 사용)
 export interface Tag {
   id: number;
   name: string;
   service: string;
+  tagCode: string; // 태그 코드 (예: "TAG-001")
   tagNumber: number; // 서비스별 순번
   deviceCount: number;
   description: string;
 }
 
-// 서비스 필터 옵션
-export const SERVICE_FILTER_OPTIONS = [
-  "전체 서비스",
-  "서비스 A",
-  "서비스 B",
-  "서비스 C",
-];
+// --- API 요청 타입 (swagger snake_case) ---
 
-// 모달에서 사용할 서비스 선택 옵션 (전체 제외)
-export const SERVICE_OPTIONS = ["서비스 A", "서비스 B", "서비스 C"];
+/** 태그 목록 요청 */
+export interface TagListRequest {
+  service_id?: number;
+  keyword?: string;
+  page: number;
+  size: number;
+}
 
-// 목 데이터 (10건)
-export const MOCK_TAGS: Tag[] = [
-  {
-    id: 1,
-    name: "VIP",
-    service: "서비스 A",
-    tagNumber: 1,
-    deviceCount: 1234,
-    description:
-      "우수 고객 전용 태그. VIP 혜택 및 프리미엄 알림 발송 시 사용됩니다.",
-  },
-  {
-    id: 2,
-    name: "이벤트 구독",
-    service: "서비스 A",
-    tagNumber: 2,
-    deviceCount: 8502,
-    description:
-      "마케팅 이벤트 및 프로모션 정보 수신에 동의한 기기 그룹입니다.",
-  },
-  {
-    id: 3,
-    name: "야간 알림",
-    service: "서비스 B",
-    tagNumber: 1,
-    deviceCount: 342,
-    description:
-      "야간 시간대(21:00 ~ 08:00)에도 알림 수신을 허용한 사용자 그룹입니다.",
-  },
-  {
-    id: 4,
-    name: "마케팅 동의",
-    service: "서비스 A",
-    tagNumber: 3,
-    deviceCount: 12100,
-    description:
-      "개인정보 수집 및 마케팅 활용에 동의한 전체 사용자 태그입니다.",
-  },
-  {
-    id: 5,
-    name: "테스트 그룹",
-    service: "서비스 C",
-    tagNumber: 1,
-    deviceCount: 15,
-    description:
-      "내부 개발 및 기능 테스트를 위한 사내 테스트용 기기 목록입니다.",
-  },
-  {
-    id: 6,
-    name: "공지사항 필수",
-    service: "서비스 B",
-    tagNumber: 2,
-    deviceCount: 45200,
-    description:
-      "서비스 점검 등 필수 공지사항을 반드시 수신해야 하는 대상입니다.",
-  },
-  {
-    id: 7,
-    name: "신규 가입",
-    service: "서비스 A",
-    tagNumber: 4,
-    deviceCount: 3750,
-    description:
-      "최근 30일 이내 신규 가입한 사용자 기기 그룹입니다.",
-  },
-  {
-    id: 8,
-    name: "결제 알림",
-    service: "서비스 B",
-    tagNumber: 3,
-    deviceCount: 9820,
-    description:
-      "결제 완료, 환불 등 거래 관련 알림을 수신하는 대상입니다.",
-  },
-  {
-    id: 9,
-    name: "베타 테스터",
-    service: "서비스 C",
-    tagNumber: 2,
-    deviceCount: 87,
-    description:
-      "신규 기능 베타 테스트에 참여 중인 외부 사용자 그룹입니다.",
-  },
-  {
-    id: 10,
-    name: "휴면 계정",
-    service: "서비스 B",
-    tagNumber: 4,
-    deviceCount: 2140,
-    description:
-      "90일 이상 미접속한 휴면 상태 사용자 기기 그룹입니다.",
-  },
-];
+/** 태그 생성 요청 */
+export interface CreateTagRequest {
+  service_id: number;
+  tag_name: string;
+  description?: string;
+}
+
+/** 태그 수정 요청 */
+export interface UpdateTagRequest {
+  tag_id: number;
+  tag_code: string;
+  description?: string;
+}
+
+/** 태그 삭제 요청 */
+export interface DeleteTagRequest {
+  tag_id: number;
+  tag_code: string;
+}
+
+// --- API 응답 타입 (실제 서버 응답 기준) ---
+
+/** 태그 목록 항목 (TagSummaryDto) */
+export interface TagListItem {
+  tag_index: number;
+  tag_id: number;
+  tag_code: string | null;
+  tag_name: string | null;
+  service_id: number;
+  service_name: string | null;
+  device_count: number;
+  description: string | null;
+  created_at: string | null;
+  updated_at: string | null;
+}
+
+/** 태그 단건 응답 (TagResponseDto) — create/update 응답 */
+export interface TagResponse {
+  tag_id: number;
+  tag_name: string | null;
+  description: string | null;
+  service_id: number;
+  service_name: string | null;
+  created_at: string;
+  updated_at: string | null;
+}
+
+/** 태그 목록 페이지네이션 */
+export interface TagPagination {
+  page: number;
+  size: number;
+  total_count: number;
+  total_pages: number;
+}
+
+/** 태그 목록 응답 */
+export interface TagListResponse {
+  items: TagListItem[];
+  pagination: TagPagination;
+}