diff --git a/packages/material_ui/lib/src/_about_io.dart b/packages/material_ui/lib/src/_about_io.dart
new file mode 100644
index 00000000000..bda9d23d9f0
--- /dev/null
+++ b/packages/material_ui/lib/src/_about_io.dart
@@ -0,0 +1,11 @@
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:io' show Platform;
+
+/// The file name of the currently running executable.
+///
+/// Used as the fallback application name by the about dialog widgets when
+/// no `Title` ancestor is available.
+String get executableName => Platform.resolvedExecutable.split(Platform.pathSeparator).last;
diff --git a/packages/material_ui/lib/src/_about_web.dart b/packages/material_ui/lib/src/_about_web.dart
new file mode 100644
index 00000000000..6da44e22387
--- /dev/null
+++ b/packages/material_ui/lib/src/_about_web.dart
@@ -0,0 +1,8 @@
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/// The file name of the currently running executable.
+///
+/// There is no executable on the web, so this is always the empty string.
+String get executableName => '';
diff --git a/packages/material_ui/lib/src/about.dart b/packages/material_ui/lib/src/about.dart
index be76f7f4ccb..28d2df8a4d3 100644
--- a/packages/material_ui/lib/src/about.dart
+++ b/packages/material_ui/lib/src/about.dart
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+/// @docImport 'dart:io';
+///
 /// @docImport 'package:cupertino_ui/cupertino_ui.dart';
 ///
 /// @docImport 'drawer.dart';
@@ -9,13 +11,13 @@
 library;
 
 import 'dart:developer' show Flow, Timeline;
-import 'dart:io' show Platform;
 
 import 'package:cupertino_ui/cupertino_ui.dart' show CupertinoDialogAction;
 import 'package:flutter/foundation.dart';
 import 'package:flutter/scheduler.dart';
 import 'package:flutter/widgets.dart' hide Flow;
 
+import '_about_io.dart' if (dart.library.js_interop) '_about_web.dart' as about;
 import 'app_bar.dart';
 import 'back_button.dart';
 import 'card.dart';
@@ -1201,7 +1203,7 @@ String _defaultApplicationName(BuildContext context) {
   // can provide an explicit applicationName to the widgets defined in this
   // file, instead of relying on the default.
   final Title? ancestorTitle = context.findAncestorWidgetOfExactType<Title>();
-  return ancestorTitle?.title ?? Platform.resolvedExecutable.split(Platform.pathSeparator).last;
+  return ancestorTitle?.title ?? about.executableName;
 }
 
 String _defaultApplicationVersion(BuildContext context) {
diff --git a/packages/material_ui/pending_changelogs/change_2026_09_07_about_dart_io.yaml b/packages/material_ui/pending_changelogs/change_2026_09_07_about_dart_io.yaml
new file mode 100644
index 00000000000..86ac579ed0c
--- /dev/null
+++ b/packages/material_ui/pending_changelogs/change_2026_09_07_about_dart_io.yaml
@@ -0,0 +1,3 @@
+changelog: |
+  - Removes the unconditional `dart:io` import from `AboutDialog`, so that `material_ui` is correctly detected as supporting the web platform and `showAboutDialog` no longer throws on the web when no application name is available.
+version: patch
diff --git a/packages/material_ui/test/about_test.dart b/packages/material_ui/test/about_test.dart
index c300f76978f..0390e7b8e1e 100644
--- a/packages/material_ui/test/about_test.dart
+++ b/packages/material_ui/test/about_test.dart
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 import 'dart:async';
+import 'dart:io' show Platform;
 import 'dart:ui';
 
 import 'package:cupertino_ui/cupertino_ui.dart';
@@ -16,6 +17,47 @@ void main() {
     LicenseRegistry.reset();
   });
 
+  Widget buildWithoutTitle(Widget child) {
+    return MediaQuery(
+      data: const MediaQueryData(),
+      child: Localizations(
+        locale: const Locale('en', 'US'),
+        delegates: const <LocalizationsDelegate<dynamic>>[
+          DefaultMaterialLocalizations.delegate,
+          DefaultWidgetsLocalizations.delegate,
+        ],
+        child: Directionality(
+          textDirection: TextDirection.ltr,
+          child: Theme(data: ThemeData(), child: child),
+        ),
+      ),
+    );
+  }
+
+  testWidgets(
+    'AboutDialog defaults the application name to the executable name without a Title ancestor',
+    (WidgetTester tester) async {
+      // Regression test for https://github.com/flutter/flutter/issues/191887.
+      await tester.pumpWidget(buildWithoutTitle(const AboutDialog()));
+
+      final String expectedName = Platform.resolvedExecutable.split(Platform.pathSeparator).last;
+      expect(find.text(expectedName), findsOneWidget);
+    },
+    skip: kIsWeb, // [intended] There is no executable name on the web.
+  );
+
+  testWidgets(
+    'AboutDialog does not throw on the web without a Title ancestor',
+    (WidgetTester tester) async {
+      // Regression test for https://github.com/flutter/flutter/issues/191887.
+      await tester.pumpWidget(buildWithoutTitle(const AboutDialog()));
+
+      expect(tester.takeException(), isNull);
+      expect(find.byType(AboutDialog), findsOneWidget);
+    },
+    skip: !kIsWeb, // [intended] Exercises the web-specific fallback.
+  );
+
   testWidgets('Material3 has sentence case labels', (WidgetTester tester) async {
     await tester.pumpWidget(
       MaterialApp(