diff --git a/ui/desktop/CHANGELOG.md b/ui/desktop/CHANGELOG.md
index 614ad5f8a..93e8fb472 100644
--- a/ui/desktop/CHANGELOG.md
+++ b/ui/desktop/CHANGELOG.md
@@ -4,6 +4,10 @@ Canonical reference for changes, improvements, and bugfixes for Boundary Desktop
 
 ## Next
 
+### New
+
+- Add prompt to close sessions when quitting client. ([PR](https://github.com/hashicorp/boundary-ui/pull/555))
+
 ### Bug Fixes
 
 - Close spawned boundary process on session cancel. ([PR](https://github.com/hashicorp/boundary-ui/pull/549))
diff --git a/ui/desktop/electron-app/src/index.js b/ui/desktop/electron-app/src/index.js
index 93c9c3024..1f220eb85 100644
--- a/ui/desktop/electron-app/src/index.js
+++ b/ui/desktop/electron-app/src/index.js
@@ -7,9 +7,9 @@ const {
 const {
   session,
   app,
+  dialog,
   protocol,
   BrowserWindow,
-  ipcMain,
   Menu,
   MenuItem,
 } = require('electron');
@@ -17,6 +17,7 @@ require('./ipc/handlers.js');
 
 const runtimeSettings = require('./services/runtime-settings.js');
 const { generateCSPHeader } = require('./config/content-security-policy.js');
+const sessionManager = require('./services/session-manager.js');
 
 const menu = require('./config/menu.js');
 const appUpdater = require('./helpers/app-updater.js');
@@ -183,6 +184,30 @@ app.on('ready', async () => {
   });
 });
 
+/**
+ * Prompt for closing spawned processes
+ */
+app.on('before-quit', (event) => {
+  if (sessionManager.hasRunningSessions) {
+    const dialogOpts = {
+      type: 'question',
+      buttons: ['Close', 'Cancel'],
+      detail: 'Close sessions before quitting?',
+    };
+
+    dialog.showMessageBox(dialogOpts).then((returnValue) => {
+      switch (returnValue.response) {
+        case 0:
+          sessionManager.stopAll();
+          break;
+        default:
+          event.preventDefault();
+          break;
+      }
+    });
+  }
+});
+
 // Handle an unhandled error in the main thread
 //
 // Note that 'uncaughtException' is a crude mechanism for exception handling intended to
diff --git a/ui/desktop/electron-app/src/models/session-manager.js b/ui/desktop/electron-app/src/models/session-manager.js
index dfcfd923a..311d86899 100644
--- a/ui/desktop/electron-app/src/models/session-manager.js
+++ b/ui/desktop/electron-app/src/models/session-manager.js
@@ -3,6 +3,14 @@ const Session = require('./session.js');
 class SessionManager {
   #sessions = [];
 
+  /**
+   * Checks for running sessions
+   * @returns {boolean}
+   */
+  get hasRunningSessions() {
+    return Boolean(this.#sessions.find((session) => session.isRunning));
+  }
+
   /**
    * Start a session and track it.
    * Returns session proxy details if successfully started.
@@ -23,10 +31,11 @@ class SessionManager {
    */
   stopById(session_id) {
     const session = this.#sessions.find((session) => session.id === session_id);
-    return session.stop();
+    return session?.stop?.();
   }
 
   stopAll() {
+    this.#sessions.forEach((session) => session.stop());
   }
 }
 
diff --git a/ui/desktop/electron-app/src/models/session.js b/ui/desktop/electron-app/src/models/session.js
index 6ec9d3ce8..a59316f7f 100644
--- a/ui/desktop/electron-app/src/models/session.js
+++ b/ui/desktop/electron-app/src/models/session.js
@@ -36,7 +36,7 @@ class Session {
   /**
    * @return {boolean}
    */
-  get isActive() {
+  get isRunning() {
     return !this.#process.killed;
   }
 
@@ -60,12 +60,12 @@ class Session {
    */
   stop() {
     return new Promise((resolve, reject) => {
-      if (this.isActive) {
+      if (this.isRunning) {
         this.#process.on('close', () => resolve());
         this.#process.on('error', (e) => reject(e));
         this.#process.kill();
       } else {
-        // Do nothing when process isn't active
+        // Do nothing when process isn't running
         resolve();
       }
     });
diff --git a/ui/desktop/electron-app/src/utils/sanitizer.js b/ui/desktop/electron-app/src/utils/sanitizer.js
index 9e635b0d5..5dbc5efa9 100644
--- a/ui/desktop/electron-app/src/utils/sanitizer.js
+++ b/ui/desktop/electron-app/src/utils/sanitizer.js
@@ -21,7 +21,7 @@ module.exports = {
   urlValidate: (str) => {
     try {
       const url = new URL(str);
-      return `${url.protocol}://${url.host}`;
+      return `${url.protocol}//${url.host}`;
     } catch (e) {
       // Parse error
       throw new Error(`URL ${str} could not be validated.`);