diff --git a/backend/internal/handler/user_handler.go b/backend/internal/handler/user_handler.go
index db734038..ce1530a9 100644
--- a/backend/internal/handler/user_handler.go
+++ b/backend/internal/handler/user_handler.go
@@ -615,9 +615,12 @@ func (h *UserHandler) ExportUsersCSV(c *fiber.Ctx) error {
 	}
 
 	// 3. Set CSV Headers
-	c.Set("Content-Type", "text/csv")
+	c.Set("Content-Type", "text/csv; charset=utf-8")
 	c.Set("Content-Disposition", "attachment; filename=users_export_"+time.Now().Format("20060102")+".csv")
 
+	// [New] Write UTF-8 BOM for Excel compatibility
+	_, _ = c.Write([]byte{0xEF, 0xBB, 0xBF})
+
 	writer := csv.NewWriter(c)
 	defer writer.Flush()