diff --git a/script/tool/lib/src/pubspec_check_command.dart b/script/tool/lib/src/pubspec_check_command.dart
index bccdad5c78..378dfc65ca 100644
--- a/script/tool/lib/src/pubspec_check_command.dart
+++ b/script/tool/lib/src/pubspec_check_command.dart
@@ -332,7 +332,7 @@ class PubspecCheckCommand extends PackageLoopingCommand {
         false;
   }
 
-  // Validates the "implements" keyword for a plugin, returning an error
+  // Validates the "topics" keyword for a plugin, returning an error
   // string if there are any issues.
   String? _checkTopics(
     Pubspec pubspec, {
@@ -343,6 +343,10 @@ class PubspecCheckCommand extends PackageLoopingCommand {
       return 'A published package should include "topics". '
           'See https://dart.dev/tools/pub/pubspec#topics.';
     }
+    if (topics.length > 5) {
+      return 'A published package should have maximum 5 topics. '
+          'See https://dart.dev/tools/pub/pubspec#topics.';
+    }
     if (isFlutterPlugin(package) && package.isFederated) {
       final String pluginName = package.directory.parent.basename;
       // '_' isn't allowed in topics, so convert to '-'.
@@ -352,6 +356,19 @@ class PubspecCheckCommand extends PackageLoopingCommand {
             'a topic. Add "$topicName" to the "topics" section.';
       }
     }
+    
+    // Validates topic names according to https://dart.dev/tools/pub/pubspec#topics
+    final RegExp expectedTopicFormat = RegExp(r'^[a-z](?:-?[a-z0-9]+)*$');
+    final Iterable<String> invalidTopics = topics.where((String topic) =>
+        !expectedTopicFormat.hasMatch(topic) ||
+        topic.length < 2 ||
+        topic.length > 32);
+    if (invalidTopics.isNotEmpty) {
+      return 'Invalid topic(s): ${invalidTopics.join(', ')} in "topics" section. '
+          'Topics must consist of lowercase alphanumerical characters or dash (but no double dash), '
+          'start with a-z and ending with a-z or 0-9, have a minimum of 2 characters '
+          'and have a maximum of 32 characters.';
+    }
     return null;
   }
 
diff --git a/script/tool/test/pubspec_check_command_test.dart b/script/tool/test/pubspec_check_command_test.dart
index 60bcc2d478..8e99d720f5 100644
--- a/script/tool/test/pubspec_check_command_test.dart
+++ b/script/tool/test/pubspec_check_command_test.dart
@@ -633,6 +633,270 @@ ${_topicsSection()}
       );
     });
 
+    test('fails when topic name contains a space', () async {
+      final RepositoryPackage plugin =
+          createFakePlugin('plugin', packagesDir, examples: <String>[]);
+
+      plugin.pubspecFile.writeAsStringSync('''
+${_headerSection('plugin')}
+${_environmentSection()}
+${_flutterSection(isPlugin: true)}
+${_dependenciesSection()}
+${_devDependenciesSection()}
+${_topicsSection(<String>['plugin a'])}
+''');
+
+      Error? commandError;
+      final List<String> output = await runCapturingPrint(
+          runner, <String>['pubspec-check'], errorHandler: (Error e) {
+        commandError = e;
+      });
+
+      expect(commandError, isA<ToolExit>());
+      expect(
+        output,
+        containsAllInOrder(<Matcher>[
+          contains('Invalid topic(s): plugin a in "topics" section. '),
+        ]),
+      );
+    });
+
+    test('fails when topic a topic name contains double dash', () async {
+      final RepositoryPackage plugin =
+          createFakePlugin('plugin', packagesDir, examples: <String>[]);
+
+      plugin.pubspecFile.writeAsStringSync('''
+${_headerSection('plugin')}
+${_environmentSection()}
+${_flutterSection(isPlugin: true)}
+${_dependenciesSection()}
+${_devDependenciesSection()}
+${_topicsSection(<String>['plugin--a'])}
+''');
+
+      Error? commandError;
+      final List<String> output = await runCapturingPrint(
+          runner, <String>['pubspec-check'], errorHandler: (Error e) {
+        commandError = e;
+      });
+
+      expect(commandError, isA<ToolExit>());
+      expect(
+        output,
+        containsAllInOrder(<Matcher>[
+          contains('Invalid topic(s): plugin--a in "topics" section. '),
+        ]),
+      );
+    });
+
+    test('fails when topic a topic name starts with a number', () async {
+      final RepositoryPackage plugin =
+          createFakePlugin('plugin', packagesDir, examples: <String>[]);
+
+      plugin.pubspecFile.writeAsStringSync('''
+${_headerSection('plugin')}
+${_environmentSection()}
+${_flutterSection(isPlugin: true)}
+${_dependenciesSection()}
+${_devDependenciesSection()}
+${_topicsSection(<String>['1plugin-a'])}
+''');
+
+      Error? commandError;
+      final List<String> output = await runCapturingPrint(
+          runner, <String>['pubspec-check'], errorHandler: (Error e) {
+        commandError = e;
+      });
+
+      expect(commandError, isA<ToolExit>());
+      expect(
+        output,
+        containsAllInOrder(<Matcher>[
+          contains('Invalid topic(s): 1plugin-a in "topics" section. '),
+        ]),
+      );
+    });
+
+    test('fails when topic a topic name contains uppercase', () async {
+      final RepositoryPackage plugin =
+          createFakePlugin('plugin', packagesDir, examples: <String>[]);
+
+      plugin.pubspecFile.writeAsStringSync('''
+${_headerSection('plugin')}
+${_environmentSection()}
+${_flutterSection(isPlugin: true)}
+${_dependenciesSection()}
+${_devDependenciesSection()}
+${_topicsSection(<String>['plugin-A'])}
+''');
+
+      Error? commandError;
+      final List<String> output = await runCapturingPrint(
+          runner, <String>['pubspec-check'], errorHandler: (Error e) {
+        commandError = e;
+      });
+
+      expect(commandError, isA<ToolExit>());
+      expect(
+        output,
+        containsAllInOrder(<Matcher>[
+          contains('Invalid topic(s): plugin-A in "topics" section. '),
+        ]),
+      );
+    });
+
+    test('fails when there are more than 5 topics', () async {
+      final RepositoryPackage plugin =
+          createFakePlugin('plugin', packagesDir, examples: <String>[]);
+
+      plugin.pubspecFile.writeAsStringSync('''
+${_headerSection('plugin')}
+${_environmentSection()}
+${_flutterSection(isPlugin: true)}
+${_dependenciesSection()}
+${_devDependenciesSection()}
+${_topicsSection(<String>[
+            'plugin-a',
+            'plugin-a',
+            'plugin-a',
+            'plugin-a',
+            'plugin-a',
+            'plugin-a'
+          ])}
+''');
+
+      Error? commandError;
+      final List<String> output = await runCapturingPrint(
+          runner, <String>['pubspec-check'], errorHandler: (Error e) {
+        commandError = e;
+      });
+
+      expect(commandError, isA<ToolExit>());
+      expect(
+        output,
+        containsAllInOrder(<Matcher>[
+          contains(
+              '  A published package should have maximum 5 topics. See https://dart.dev/tools/pub/pubspec#topics.'),
+        ]),
+      );
+    });
+
+    test('fails if a topic name is longer than 32 characters', () async {
+      final RepositoryPackage plugin =
+          createFakePlugin('plugin', packagesDir, examples: <String>[]);
+
+      plugin.pubspecFile.writeAsStringSync('''
+${_headerSection('plugin')}
+${_environmentSection()}
+${_flutterSection(isPlugin: true)}
+${_dependenciesSection()}
+${_devDependenciesSection()}
+${_topicsSection(<String>['foobarfoobarfoobarfoobarfoobarfoobarfoo'])}
+''');
+
+      Error? commandError;
+      final List<String> output = await runCapturingPrint(
+          runner, <String>['pubspec-check'], errorHandler: (Error e) {
+        commandError = e;
+      });
+
+      expect(commandError, isA<ToolExit>());
+      expect(
+        output,
+        containsAllInOrder(<Matcher>[
+          contains(
+              'Invalid topic(s): foobarfoobarfoobarfoobarfoobarfoobarfoo in "topics" section. '),
+        ]),
+      );
+    });
+
+    test('fails if a topic name is longer than 2 characters', () async {
+      final RepositoryPackage plugin =
+          createFakePlugin('plugin', packagesDir, examples: <String>[]);
+
+      plugin.pubspecFile.writeAsStringSync('''
+${_headerSection('plugin')}
+${_environmentSection()}
+${_flutterSection(isPlugin: true)}
+${_dependenciesSection()}
+${_devDependenciesSection()}
+${_topicsSection(<String>['a'])}
+''');
+
+      Error? commandError;
+      final List<String> output = await runCapturingPrint(
+          runner, <String>['pubspec-check'], errorHandler: (Error e) {
+        commandError = e;
+      });
+
+      expect(commandError, isA<ToolExit>());
+      expect(
+        output,
+        containsAllInOrder(<Matcher>[
+          contains('Invalid topic(s): a in "topics" section. '),
+        ]),
+      );
+    });
+
+    test('fails if a topic name ends in a dash', () async {
+      final RepositoryPackage plugin =
+          createFakePlugin('plugin', packagesDir, examples: <String>[]);
+
+      plugin.pubspecFile.writeAsStringSync('''
+${_headerSection('plugin')}
+${_environmentSection()}
+${_flutterSection(isPlugin: true)}
+${_dependenciesSection()}
+${_devDependenciesSection()}
+${_topicsSection(<String>['plugin-'])}
+''');
+
+      Error? commandError;
+      final List<String> output = await runCapturingPrint(
+          runner, <String>['pubspec-check'], errorHandler: (Error e) {
+        commandError = e;
+      });
+
+      expect(commandError, isA<ToolExit>());
+      expect(
+        output,
+        containsAllInOrder(<Matcher>[
+          contains('Invalid topic(s): plugin- in "topics" section. '),
+        ]),
+      );
+    });
+
+    test('Invalid topics section has expected error message', () async {
+      final RepositoryPackage plugin =
+          createFakePlugin('plugin', packagesDir, examples: <String>[]);
+
+      plugin.pubspecFile.writeAsStringSync('''
+${_headerSection('plugin')}
+${_environmentSection()}
+${_flutterSection(isPlugin: true)}
+${_dependenciesSection()}
+${_devDependenciesSection()}
+${_topicsSection(<String>['plugin-A', 'Plugin-b'])}
+''');
+
+      Error? commandError;
+      final List<String> output = await runCapturingPrint(
+          runner, <String>['pubspec-check'], errorHandler: (Error e) {
+        commandError = e;
+      });
+
+      expect(commandError, isA<ToolExit>());
+      expect(
+        output,
+        containsAllInOrder(<Matcher>[
+          contains('Invalid topic(s): plugin-A, Plugin-b in "topics" section. '
+              'Topics must consist of lowercase alphanumerical characters or dash (but no double dash), '
+              'start with a-z and ending with a-z or 0-9, have a minimum of 2 characters '
+              'and have a maximum of 32 characters.'),
+        ]),
+      );
+    });
+
     test('fails when environment section is out of order', () async {
       final RepositoryPackage plugin =
           createFakePlugin('plugin', packagesDir, examples: <String>[]);