Saleen, Incorporated, commonly known as Saleen, is an American manufacturer of high performance sports cars and high performance automotive parts based in Irvine, California. Saleen is a Delaware corporation owned by Hancock Park Associates.

Saleen manufactures limited edition, high-performance vehicles. Saleen is an automotive original equipment manufacturer (OEM) and the last American small car manufacturer bearing OEM status. Unlike aftermarket "tuner" companies, Saleen is subject to the same federal regulations governing design and testing of their automotive products as larger vehicle manufacturers such as Ford, General Motors, or Toyota. Most of Saleen's vehicles are highly modified versions of existing mass produced sports cars such as the Ford Mustang. Saleen has produced over 8,000 modified Mustangs since its inception. It also produces modified versions of a number of other Ford models.

Saleen's flagship car is the Saleen S7, introduced in 2000. The S7 is a mid-engine, high-performance supercar that was initially priced at just under US$400,000. The S7 won four different GT championships in 2001 and has broken records at the prestigious 24-Hour Le Mans race. The S7 is Saleen's first production car not based on an existing design.

The parts and gear department of the company markets car parts and accessories such as custom wheels, exhaust systems, brakes and other high performance parts. Saleen operated a retail store at the Irvine Spectrum in Irvine, California to sell these car parts and accessories directly to customers and to offer vehicle sales without a need for a sales-lot. However, the store was quietly closed on December 7, 2007.

Saleen operates an assembly plant (Saleen Special Vehicles) in Troy, Michigan where it conducted assembly and painting for the Ford GT supercar for Ford Motor Company and currently offers prototyping and show-car building services to other automotive OEMs.

As of mid-2005, Saleen discontinued manufacture of the "Nitrous-ready" N2O S121 Saleen Focus. The 550 hp (410 kW) naturally-aspirated mid-engine Saleen S7 was discontinued after the 2004 model year with the introduction of the Saleen S7TT although both editions are commonly referred to as the Saleen S7.