The Nissan 180SX is a fastback automobile that Nissan Motors produced between 1988 and 1998. It is based on the S13 chassis from the Nissan S platform with the variants receiving an R designation. It was sold exclusively in Japan paired with the CA18 motor in the early models; later models paired with the SR20 motor. Outside of Japan, it was re-badged as the 200SX and in the US market as the Nissan 240SX, paired with the single overhead cam KA24E motor and later with the dual-overhead model KA24DE.

The Nissan 240SX is a sports compact car that was introduced to the North American market by Nissan in 1989 for the 1990 model year. It replaced the outgoing 200SX (S12) model. Most of the 240SXs were equipped with the 2.4-liter inline 4 engine. The KA24E had single overhead cams and the KA24DE had dual overhead cams. Two distinct generations of the 240SX, the S13 (1989–1994) the S14 (1994-1998) were produced, based on the Nissan S platform.