diff --git a/doc/api/users.md b/doc/api/users.md
index c7a47298c9373a7ca8585b440b45f03dee820754..9302c541754496685761ed17d55b8003e78f78b9 100644
--- a/doc/api/users.md
+++ b/doc/api/users.md
@@ -2543,3 +2543,43 @@ Example response:
     "token_expires_at": null
 }
 ```
+
+## Upload a current user avatar
+
+> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/148130) in GitLab 17.0.
+
+Upload an avatar to current user.
+
+```plaintext
+PUT /user/avatar
+```
+
+| Attribute | Type              | Required | Description                                                                                                 |
+|-----------|-------------------|----------|-------------------------------------------------------------------------------------------------------------|
+| `avatar`  | string            | Yes      | The file to be uploaded. The ideal image size is 192 x 192 pixels. The maximum file size allowed is 200 KiB. |
+
+To upload an avatar from your file system, use the `--form` argument. This causes
+cURL to post data using the header `Content-Type: multipart/form-data`. The
+`file=` parameter must point to an image file on your file system and be
+preceded by `@`. For example:
+
+Example request:
+
+```shell
+curl --request PUT --header "Bearer: <your_access_token>" \
+     --form "avatar=@avatar.png" \
+     --url "https://gitlab.example.com/api/v4/user/avatar"
+```
+
+Returned object:
+
+Returns `400 Bad Request` for file sizes greater than 200 KiB.
+
+If successful, returns [`200`](rest/index.md#status-codes) and the following
+response attributes:
+
+```json
+{
+  "avatar_url": "http://gdk.test:3000/uploads/-/system/user/avatar/76/avatar.png",
+}
+```
diff --git a/lib/api/users.rb b/lib/api/users.rb
index 8b290875870f9b6589cd2e45d3dd68120b70071f..315c8556b8107d057f959f61f830c65fcfcbb5be 100644
--- a/lib/api/users.rb
+++ b/lib/api/users.rb
@@ -1394,6 +1394,27 @@ def set_user_status(include_missing_params:)
         present current_user.status || {}, with: Entities::UserStatus
       end
 
+      desc 'Set the avatar of the current user' do
+        success Entities::Avatar
+        detail 'This feature was introduced in GitLab 17.0.'
+      end
+      params do
+        requires :avatar, type: ::API::Validations::Types::WorkhorseFile, desc: 'The avatar file (generated by Multipart middleware)', documentation: { type: 'file' }
+      end
+      put "avatar", feature_category: :user_profile do
+        update_params = {
+          avatar: declared_params[:avatar],
+          user: current_user
+        }
+        result = ::Users::UpdateService.new(current_user, update_params).execute
+
+        if result[:status] == :success
+          present current_user, with: Entities::Avatar
+        else
+          render_api_error!(result[:message], result[:reason] || :bad_request)
+        end
+      end
+
       resource :personal_access_tokens do
         desc 'Create a personal access token with limited scopes for the currently authenticated user' do
           detail 'This feature was introduced in GitLab 16.5'
diff --git a/spec/requests/api/users_spec.rb b/spec/requests/api/users_spec.rb
index d14e672cd411e9b03584922d23843e5826a29d9f..0c930396c9c54d7cf7331a0a10f0859d3ed4b5be 100644
--- a/spec/requests/api/users_spec.rb
+++ b/spec/requests/api/users_spec.rb
@@ -4607,6 +4607,36 @@ def update_password(user, admin, password = User.random_password)
     end
   end
 
+  describe 'PUT /user/avatar' do
+    let(:path) { "/user/avatar" }
+
+    it "returns 200 OK on success" do
+      workhorse_form_with_file(
+        api(path, user),
+        method: :put,
+        file_key: :avatar,
+        params: { avatar: fixture_file_upload('spec/fixtures/banana_sample.gif', 'image/gif') }
+      )
+
+      user.reload
+      expect(user.avatar).to be_present
+      expect(response).to have_gitlab_http_status(:ok)
+      expect(json_response['avatar_url']).to include(user.avatar_path)
+    end
+
+    it "returns 400 when avatar file size over 200 KiB" do
+      workhorse_form_with_file(
+        api(path, user),
+        method: :put,
+        file_key: :avatar,
+        params: { avatar: fixture_file_upload('spec/fixtures/big-image.png', 'image/png') }
+      )
+
+      expect(response).to have_gitlab_http_status(:bad_request)
+      expect(json_response['message']).to include("Avatar is too big (should be at most 200 KiB)")
+    end
+  end
+
   describe 'POST /users/:user_id/personal_access_tokens' do
     let(:name) { 'new pat' }
     let(:expires_at) { 3.days.from_now.to_date.to_s }
diff --git a/workhorse/cmd/gitlab-workhorse/upload_test.go b/workhorse/cmd/gitlab-workhorse/upload_test.go
index a6070cfeea656500fdd000e19f08d3200f87e412..4e4312f809e51f4586ede1e93af5b82df1450877 100644
--- a/workhorse/cmd/gitlab-workhorse/upload_test.go
+++ b/workhorse/cmd/gitlab-workhorse/upload_test.go
@@ -153,6 +153,7 @@ func TestAcceleratedUpload(t *testing.T) {
 		{"PUT", `/api/v4/groups/group%2Fsubgroup`, false},
 		{"POST", `/api/v4/groups/1/wikis/attachments`, false},
 		{"POST", `/api/v4/groups/my%2Fsubgroup/wikis/attachments`, false},
+		{"PUT", `/api/v4/user/avatar`, false},
 		{"POST", `/api/v4/users`, false},
 		{"PUT", `/api/v4/users/42`, false},
 		{"PUT", "/api/v4/projects/9001/packages/nuget/v1/files", true},
diff --git a/workhorse/internal/upstream/routes.go b/workhorse/internal/upstream/routes.go
index bc0640029bf70557298ee479a2f3ad6f70068615..92ed18aace65f11cce46c9db237d0d2dae06f7ea 100644
--- a/workhorse/internal/upstream/routes.go
+++ b/workhorse/internal/upstream/routes.go
@@ -343,6 +343,7 @@ func configureRoutes(u *upstream) {
 		u.route("PUT", apiPattern+`v4/groups/[^/]+\z`, tempfileMultipartProxy),
 
 		// User Avatar
+		u.route("PUT", apiPattern+`v4/user/avatar\z`, tempfileMultipartProxy),
 		u.route("POST", apiPattern+`v4/users\z`, tempfileMultipartProxy),
 		u.route("PUT", apiPattern+`v4/users/[0-9]+\z`, tempfileMultipartProxy),