The Ust-Katav Wagon-Building Plant, officially the Ust-Katavskiy Carriage Works named after S. M. Kirov (Russian: Усть-Катавский вагоностроительный завод имени С. М. Кирова, romanized: Ust'-Katavskiy Vagonostroitel'nyy Zavod imeni S. M. Kirova) is a railroad carriage works in Ust-Katav, Chelyabinsk Oblast, Russia.

In 2009, UKVZ offered two 71-623 partial low-floor, single-section vehicles for trial operation in Ufa and Nizhny Novgorod.

In 2010, additional trams of these models were built for Moscow, Perm, Nizhnekamsk and Krasnodar.

The plant also produces trim spare parts and provides tram maintenance services.

In addition to streetcars, the plant produces gas pressure regulators, pipeline valves, pumps and consumer goods.