A V4 is an engine in V configuration, having 4 cylinders.

Lancia produced several narrow-angle V4 engines.

Ford of Europe produced a V4 engine with a balance shaft, used in among other vehicles the Ford Corsair, that was also used by the Saab 96 and the Matra 530.

The russian ZAZ also used a V4, that also features an anti-vibration shaft.