The BMW B57 is a turbo-diesel straight-six engine, produced by BMW since 2015.

[2] The engines utilise a common displacement of 500 cc (31 cu in) per cylinder.

[3] The B57 replaced the previous N57 diesel engine, and was first introduced in the G11 7 Series.

The B57 is available in configurations of up to 4 turbochargers, that operate in a double-series layout.

[4] In addition to BMW's own brand vehicles, the BMW B57 is also used in a diesel variant of the Ineos Grenadier.