The Nissan 240SX was a car introduced to the North American market by Nissan in 1989 and sold there until 1998. The 240SX was equipped with a 2.4&nbps;L inline 4 engine (KA24E from 1989–1990 and KA24DE from 1991–1998). Two distinct generations of the 240SX, the S13 and the S14, were produced from the Nissan S platform. The 240SX is closely related to other S vehicles: the Japanese-market Silvia, 180SX , and the European-market 200SX.

Three body styles were available in the United States market: a hatchback or fastback, coupe or notchback, and convertible. The coupe is less common than the hatchback and is closely related to the Japanese Silvia, although it has the front fascia from a 180SX outside of the Japanese domestic market. The convertible was introduced in 1992 and was the only body style available in 1994, the last year of the S13 chassis.

The 240SX was redesigned with the S14 Zenki Silvia body in the spring of 1994 as a 1995 model and the convertible was dropped during that year. From 1997–1998, it sported the S14A Kouki Silvia body style and sales dwindled.

In 1998, the 240SX was no longer available in the North American market. In Japan, however, a new version of the Silvia was made available in 1999 (S15). The Silvia ceased production shortly thereafter.

Every 240SX was built in Kyushu, Japan. The last 240SX rolled off the assembly line on July 23, 1998.