diff --git a/backend/package.json b/backend/package.json
index 9686e77..e3faf55 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -9,6 +9,7 @@
     },
     "dependencies": {
         "@aws-sdk/client-s3": "^3.400.0",
+        "adm-zip": "^0.5.16",
         "bcryptjs": "^2.4.3",
         "express": "^4.18.2",
         "express-session": "^1.17.3",
diff --git a/backend/routes/admin.js b/backend/routes/admin.js
index 69d263e..6f8ee3a 100644
--- a/backend/routes/admin.js
+++ b/backend/routes/admin.js
@@ -202,13 +202,11 @@ router.get("/whitelist", async (req, res) => {
     res.json(data);
   } catch (error) {
     console.error("[Admin] 화이트리스트 조회 오류:", error);
-    res
-      .status(500)
-      .json({
-        enabled: false,
-        players: [],
-        error: "서버에 연결할 수 없습니다",
-      });
+    res.status(500).json({
+      enabled: false,
+      players: [],
+      error: "서버에 연결할 수 없습니다",
+    });
   }
 });
 
@@ -345,4 +343,134 @@ function formatFileSize(bytes) {
   return bytes + " B";
 }
 
+/**
+ * POST /api/admin/modpacks - 모드팩 업로드
+ * multipart/form-data: file (.mrpack), changelog (옵션)
+ */
+router.post(
+  "/modpacks",
+  express.raw({ type: "multipart/form-data", limit: "500mb" }),
+  async (req, res) => {
+    try {
+      const boundary = req.headers["content-type"]?.split("boundary=")[1];
+      if (!boundary) {
+        return res.status(400).json({ error: "Invalid content-type" });
+      }
+
+      const body = req.body.toString("binary");
+      const parts = body.split(`--${boundary}`);
+
+      let fileData = null;
+      let fileName = "";
+      let changelog = "";
+
+      // multipart 파싱
+      for (const part of parts) {
+        if (part.includes('name="file"')) {
+          const match = part.match(/filename="([^"]+)"/);
+          if (match) fileName = match[1];
+          const dataStart = part.indexOf("\r\n\r\n") + 4;
+          const dataEnd = part.lastIndexOf("\r\n");
+          fileData = Buffer.from(part.slice(dataStart, dataEnd), "binary");
+        } else if (part.includes('name="changelog"')) {
+          const dataStart = part.indexOf("\r\n\r\n") + 4;
+          const dataEnd = part.lastIndexOf("\r\n");
+          changelog = part.slice(dataStart, dataEnd);
+        }
+      }
+
+      if (!fileData || !fileName.endsWith(".mrpack")) {
+        return res.status(400).json({ error: ".mrpack 파일이 필요합니다" });
+      }
+
+      // .mrpack은 ZIP 파일. modrinth.index.json 파싱
+      const { unzipSync } = await import("zlib");
+      const AdmZip = (await import("adm-zip")).default;
+      const zip = new AdmZip(fileData);
+      const indexEntry = zip.getEntry("modrinth.index.json");
+
+      if (!indexEntry) {
+        return res
+          .status(400)
+          .json({ error: "modrinth.index.json을 찾을 수 없습니다" });
+      }
+
+      const indexJson = JSON.parse(indexEntry.getData().toString("utf8"));
+      const modpackName = indexJson.name || "Unknown Modpack";
+      const modpackVersion = indexJson.versionId || "1.0.0";
+      const minecraftVersion = indexJson.dependencies?.minecraft || null;
+      const modLoader =
+        Object.keys(indexJson.dependencies || {}).find(
+          (k) => k !== "minecraft"
+        ) || null;
+
+      // contents 파싱 (mods, resourcepacks, shaderpacks)
+      const contents = { mods: [], resourcepacks: [], shaderpacks: [] };
+      for (const file of indexJson.files || []) {
+        const path = file.path;
+        // 파일명에서 이름과 버전 추출 시도 (예: Create-0.5.1.jar)
+        const fileName = path
+          .split("/")
+          .pop()
+          .replace(/\.(jar|zip)$/, "");
+        const match = fileName.match(/^(.+?)[-_](\d+[\d.]+\d*)$/);
+        const name = match ? match[1].replace(/[-_]/g, " ") : fileName;
+        const version = match ? match[2] : "";
+
+        if (path.startsWith("mods/")) {
+          contents.mods.push({ name, version });
+        } else if (path.startsWith("resourcepacks/")) {
+          contents.resourcepacks.push({ name, version });
+        } else if (path.startsWith("shaderpacks/")) {
+          contents.shaderpacks.push({ name, version });
+        }
+      }
+
+      // S3에 업로드
+      const s3Key = `modpacks/${modpackName.replace(
+        /[^a-zA-Z0-9가-힣]/g,
+        "_"
+      )}/${modpackVersion}.mrpack`;
+      const { uploadToS3 } = await import("../lib/s3.js");
+      await uploadToS3("minecraft", s3Key, fileData, "application/zip");
+
+      // DB에 저장
+      const [result] = await pool.query(
+        `INSERT INTO modpacks (name, version, minecraft_version, mod_loader, changelog, file_key, file_size, contents_json)
+         VALUES (?, ?, ?, ?, ?, ?, ?, ?)
+         ON DUPLICATE KEY UPDATE 
+           changelog = VALUES(changelog),
+           file_key = VALUES(file_key),
+           file_size = VALUES(file_size),
+           contents_json = VALUES(contents_json),
+           updated_at = CURRENT_TIMESTAMP`,
+        [
+          modpackName,
+          modpackVersion,
+          minecraftVersion,
+          modLoader,
+          changelog,
+          s3Key,
+          fileData.length,
+          JSON.stringify(contents),
+        ]
+      );
+
+      console.log(
+        `[Admin] 모드팩 업로드 완료: ${modpackName} v${modpackVersion}`
+      );
+      res.json({
+        success: true,
+        id: result.insertId,
+        name: modpackName,
+        version: modpackVersion,
+        size: formatFileSize(fileData.length),
+      });
+    } catch (error) {
+      console.error("[Admin] 모드팩 업로드 오류:", error);
+      res.status(500).json({ error: "업로드 실패: " + error.message });
+    }
+  }
+);
+
 export default router;