diff --git a/util/NicknameCheck.js b/util/NicknameCheck.js
new file mode 100644
index 0000000..85352d9
--- /dev/null
+++ b/util/NicknameCheck.js
@@ -0,0 +1,19 @@
+const { PrismaClient } = require("@prisma/client");
+const prisma = new PrismaClient();
+
+// 닉네임 중복확인 함수
+async function nicknameOverlapCheck(nickname) {
+  const result = await prisma.users.findFirst({
+    where: {
+      nickname: nickname,
+    },
+    select: {
+      nickname: true,
+    },
+  });
+
+  // result === null가 true이면 사용 가능, false면 사용 불가
+  return result === null;
+}
+
+module.exports = { nicknameOverlapCheck };