diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index baa96095260..ccb1f270c72 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -41,11 +41,17 @@ jobs:
 
       matrix:
         build_type: [backend, frontend, system, annotations]
-        target: [core, plugins]
+        target: [core, plugins, themes]
         ruby: ["3.2"]
         exclude:
           - build_type: annotations
             target: plugins
+          - build_type: annotations
+            target: themes
+          - build_type: frontend
+            target: themes
+          - build_type: backend
+            target: themes
           - build_type: frontend
             target: core # Handled by core_frontend_tests job (below)
         include:
@@ -113,6 +119,10 @@ jobs:
         if: matrix.target == 'plugins'
         run: bin/rake plugin:pull_compatible_all
 
+      - name: Checkout official themes
+        if: matrix.target == 'themes'
+        run: bin/rake themes:clone_all_official
+
       - name: Add hosts to /etc/hosts, otherwise Chrome cannot reach minio
         run: |
           echo "127.0.0.1 minio.local" | sudo tee -a /etc/hosts
@@ -237,12 +247,19 @@ jobs:
           LOAD_PLUGINS=1 RAILS_ENABLE_TEST_LOG=1 RAILS_TEST_LOG_LEVEL=error PARALLEL_TEST_PROCESSORS=4 bin/turbo_rspec --use-runtime-info --profile=50 --verbose --format documentation plugins/*/spec/system
         shell: bash
         timeout-minutes: 30
-      
+
       - name: Chat System Tests
         if: matrix.build_type == 'system' && matrix.target == 'chat'
         run: LOAD_PLUGINS=1 RAILS_ENABLE_TEST_LOG=1 RAILS_TEST_LOG_LEVEL=error PARALLEL_TEST_PROCESSORS=4 bin/turbo_rspec --use-runtime-info --profile=50 --verbose --format documentation plugins/chat/spec/system
         timeout-minutes: 30
 
+      - name: Theme System Tests
+        if: matrix.build_type == 'system' && matrix.target == 'themes'
+        run: |
+          RAILS_ENABLE_TEST_LOG=1 RAILS_TEST_LOG_LEVEL=error PARALLEL_TEST_PROCESSORS=4 bin/turbo_rspec --profile=50 --verbose --format documentation tmp/themes/*/spec/system
+        shell: bash
+        timeout-minutes: 30
+
       - name: Upload failed system test screenshots
         uses: actions/upload-artifact@v3
         if: matrix.build_type == 'system' && failure()
diff --git a/lib/tasks/themes.rake b/lib/tasks/themes.rake
index e1fc052ac54..58c7b5d93be 100644
--- a/lib/tasks/themes.rake
+++ b/lib/tasks/themes.rake
@@ -194,3 +194,26 @@ ensure
   db&.remove
   redis&.remove
 end
+
+desc "Clones all official themes."
+task "themes:clone_all_official" do |task, args|
+  require "theme_metadata"
+  FileUtils.rm_rf("tmp/themes")
+
+  official_themes =
+    ThemeMetadata::OFFICIAL_THEMES.each do |theme_name|
+      repo = "https://github.com/discourse/#{theme_name}"
+      path = File.expand_path("tmp/themes/#{theme_name}")
+
+      attempts = 0
+
+      begin
+        attempts += 1
+        system("git clone #{repo} #{path}", exception: true)
+      rescue StandardError
+        abort("Failed to clone #{repo}") if attempts >= 3
+        STDERR.puts "Failed to clone #{repo}... trying again..."
+        retry
+      end
+    end
+end
diff --git a/lib/theme_metadata.rb b/lib/theme_metadata.rb
new file mode 100644
index 00000000000..c6d3df4ae0d
--- /dev/null
+++ b/lib/theme_metadata.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+class ThemeMetadata
+  OFFICIAL_THEMES =
+    Set.new(
+      %w[
+        discourse-brand-header
+        discourse-category-banners
+        discourse-clickable-topic
+        discourse-color-scheme-toggle
+        discourse-custom-header-links
+        Discourse-easy-footer
+        discourse-gifs
+        discourse-topic-thumbnails
+        discourse-search-banner
+        discourse-unanswered-filter
+        discourse-versatile-banner
+        DiscoTOC
+        unformatted-code-detector
+      ],
+    ).to_a
+end