The Toyota JZ engine family is a series of inline-6 automobile engines. A replacement for the M-series inline-6 engines, the JZ engines were 24-valve DOHC engines. The JZ engine was offered in 2.5- and 3.0-litre versions.

The 2,997 cc (3.0 L; 182.9 cu in) 2JZ has been produced since 1991 (first released in the 1991 Toyota Aristo). Cylinder bore and stroke is 86 mm × 86 mm (3.39 in × 3.39 in). VVT-i variable valve timing was added later in 1997 for the 1998 model year. This engine is not merely a stroked version of the 1JZ (although they share a common bore size, bore pitch, and general architecture), but has a taller block deck and longer connecting rods to accommodate the 14.5 mm (0.57 in) stroke increase.