The BMW S14 is a DOHC four-cylinder petrol engine which was used in the E30 M3, E30 320iS, and E36 318i Super Touring.

There is no direct successor to the S14 for production BMWs, since the following generation of M3 is powered by the BMW S50 six-cylinder engine.

[7] Versions equipped with a catalytic converter produced 143 kW (192 bhp) and 230 Nm.

[7] In April 1989, the Ravaglia and Cecotto limited edition M3s were released with a 158 kW (212 bhp) S14B23 that would in September, 1989 become the standard motor for the E30 M3.

[7] Applications: In 1989, the displacement was enlarged to 2,467 cc (2.5 L) and this engine produced 175 kW (235 hp).