diff --git a/changelogs/unreleased/api-wiki-dot-slug.yml b/changelogs/unreleased/api-wiki-dot-slug.yml
new file mode 100644
index 00000000000..82c76fa7450
--- /dev/null
+++ b/changelogs/unreleased/api-wiki-dot-slug.yml
@@ -0,0 +1,5 @@
+---
+title: 'API: Support dots in wiki slugs'
+merge_request: 24383
+author: Robert Schilling
+type: fixed
diff --git a/lib/api/wikis.rb b/lib/api/wikis.rb
index 302b2797a34..ef0e3decc2c 100644
--- a/lib/api/wikis.rb
+++ b/lib/api/wikis.rb
@@ -22,7 +22,9 @@ module API
       end
     end
 
-    resource :projects, requirements: API::NAMESPACE_OR_PROJECT_REQUIREMENTS do
+    WIKI_ENDPOINT_REQUIREMENTS = API::NAMESPACE_OR_PROJECT_REQUIREMENTS.merge(slug: API::NO_SLASH_URL_PART_REGEX)
+
+    resource :projects, requirements: WIKI_ENDPOINT_REQUIREMENTS do
       desc 'Get a list of wiki pages' do
         success Entities::WikiPageBasic
       end
@@ -103,7 +105,7 @@ module API
         requires :file, type: ::API::Validations::Types::SafeFile, desc: 'The attachment file to be uploaded'
         optional :branch, type: String, desc: 'The name of the branch'
       end
-      post ":id/wikis/attachments", requirements: API::NAMESPACE_OR_PROJECT_REQUIREMENTS do
+      post ":id/wikis/attachments" do
         authorize! :create_wiki, user_project
 
         result = ::Wikis::CreateAttachmentService.new(user_project,
diff --git a/spec/factories/wiki_pages.rb b/spec/factories/wiki_pages.rb
index 2335b5118dd..ae257d769e8 100644
--- a/spec/factories/wiki_pages.rb
+++ b/spec/factories/wiki_pages.rb
@@ -5,7 +5,7 @@ FactoryBot.define do
     transient do
       attrs do
         {
-          title: 'Title',
+          title: 'Title.with.dot',
           content: 'Content for wiki page',
           format: 'markdown'
         }
diff --git a/spec/requests/api/wikis_spec.rb b/spec/requests/api/wikis_spec.rb
index f5092e8e2b5..6109829aad1 100644
--- a/spec/requests/api/wikis_spec.rb
+++ b/spec/requests/api/wikis_spec.rb
@@ -22,7 +22,7 @@ describe API::Wikis do
     context 'when wiki has pages' do
       let!(:pages) do
         [create(:wiki_page, wiki: project_wiki, attrs: { title: 'page1', content: 'content of page1' }),
-         create(:wiki_page, wiki: project_wiki, attrs: { title: 'page2', content: 'content of page2' })]
+         create(:wiki_page, wiki: project_wiki, attrs: { title: 'page2.with.dot', content: 'content of page2' })]
       end
 
       it 'returns the list of wiki pages without content' do