OJSC «Autodiesel» (ОАО «Автоди́зель») known as the Yaroslavl Motor Plant (YaMZ), Russian: Яросла́вский мото́рный заво́д (ЯМЗ), romanized: Yaroslavskyi Motornyi Zavod (YaMZ), based in Yaroslavl, Russia, is an open joint-stock company that produces engines for many Russian companies.

Between 1925 and 1959, YaMZ produced heavy trucks.

Back then it was also known as Yaroslavl Automobile Plant (YaAZ, Yaroslavskyi Avtomobilnyi Zavod).

The trucks and buses YaMZ produced included: YaMZ produces several families of modern engines: