diff --git a/api/pages/maintenance.go b/api/pages/maintenance.go
index 0e97bcdeb..ea7f56357 100644
--- a/api/pages/maintenance.go
+++ b/api/pages/maintenance.go
@@ -4,6 +4,8 @@ import (
 	"embed"
 	"html/template"
 	"net/http"
+	"os"
+	"path/filepath"
 	"strings"
 
 	"github.com/0xJacky/Nginx-UI/settings"
@@ -13,6 +15,8 @@ import (
 //go:embed *.tmpl
 var tmplFS embed.FS
 
+const maintenanceMountDir = "/etc/nginx/maintenance"
+
 // MaintenancePageData maintenance page data structure
 type MaintenancePageData struct {
 	Title                string `json:"title"`
@@ -53,7 +57,18 @@ func MaintenancePage(c *gin.Context) {
 		return
 	}
 
-	// Parse template
+	// Try custom mounted HTML first (NGINX_UI_NGINX_MAINTENANCE_TEMPLATE)
+	if name := strings.TrimSpace(settings.NginxSettings.MaintenanceTemplate); name != "" {
+		name = filepath.Base(name)
+		full := filepath.Join(maintenanceMountDir, name)
+
+		if b, err := os.ReadFile(full); err == nil && len(b) > 0 {
+			c.Data(http.StatusServiceUnavailable, "text/html; charset=utf-8", b)
+			return
+		}
+	}
+
+	// Fallback: embedded template
 	tmpl, err := template.ParseFS(tmplFS, "maintenance.tmpl")
 	if err != nil {
 		c.String(http.StatusInternalServerError, "503 Service Unavailable")
diff --git a/app/src/api/settings.ts b/app/src/api/settings.ts
index 20fe3686a..d7b45fe13 100644
--- a/app/src/api/settings.ts
+++ b/app/src/api/settings.ts
@@ -68,6 +68,7 @@ export interface NginxSettings {
   restart_cmd: string
   stub_status_port: number
   container_name: string
+  maintenance_template?: string
 }
 
 export interface NginxLogSettings {
diff --git a/app/src/views/preference/tabs/NginxSettings.vue b/app/src/views/preference/tabs/NginxSettings.vue
index ef186860e..1cb522c2a 100644
--- a/app/src/views/preference/tabs/NginxSettings.vue
+++ b/app/src/views/preference/tabs/NginxSettings.vue
@@ -10,6 +10,14 @@ const { data } = storeToRefs(systemSettingsStore)
     <AFormItem :label="$gettext('Stub Status Port')">
       <AInputNumber v-model:value="data.nginx.stub_status_port" />
     </AFormItem>
+    <AFormItem :label="$gettext('Maintenance template (filename only)')">
+      <AInput
+        v-model:value="data.nginx.maintenance_template"
+        :placeholder="$gettext('maintenance.html')" />
+      <div class="text-secondary mt-1">
+        {{$gettext('Mounted directory')}}: /etc/nginx/maintenance
+      </div>
+    </AFormItem>
     <AFormItem :label="$gettext('Nginx Access Log Path')">
       {{ data.nginx.access_log_path }}
     </AFormItem>
diff --git a/settings/nginx.go b/settings/nginx.go
index 3636141be..c9e39e603 100644
--- a/settings/nginx.go
+++ b/settings/nginx.go
@@ -13,6 +13,7 @@ type Nginx struct {
 	RestartCmd               string   `json:"restart_cmd" protected:"true"`
 	StubStatusPort           uint     `json:"stub_status_port" binding:"omitempty,min=1,max=65535"`
 	ContainerName            string   `json:"container_name" protected:"true"`
+	MaintenanceTemplate      string   `json:"maintenance_template"`
 }
 
 var NginxSettings = &Nginx{}