Nissan Motor Co., Ltd. which formerly marketed vehicles under the Datsun brand name, is a Japanese automobile manufacturer. The company's main offices are located in the Ginza area of Chuo-ku, Tokyo, Japan. Nissan plans to move their headquarters to Yokohama, Kanagawa by 2010; the headquarters will start construction in 2007.

The company marketed vehicles under the Nissan and Datsun brand names until 1983, when the Datsun brand name was dropped. Nissan used to be Japan's second largest car company after Toyota, but it has dropped to third in size after Honda. Due to financial problems throughout the 1990s, the French manufacturer Renault bought a controlling share in the company and installed Carlos Ghosn as president, the first non-Japanese person to run a Japanese car company (Mazda was run by an American, Mark Fields and by Briton Lewis Booth and Mitsubishi was run by a German, Rolf Eckrodt).

Under Ghosn's "Nissan Revival Plan" (NRP), Nissan has rebounded in what many leading economists consider to be one of the most spectacular corporate turnarounds in history, catapulting Nissan to record profits and a dramatic revitalization of both its Nissan and Infiniti model line-ups. In 2001, the company initiated Nissan 180, capitalizing on the success of the NRP. Ghosn has since been idolized as a national hero in Japan as a symbol of the strength of the currently ailing Japanese economy, with Ghosn and the Nissan revival story prominently featured in Japanese manga and popular culture. His achievements in revitalizing the Japanese company have been noted by Emperor Akihito, who awarded him the Japan Medal with Blue Ribbon in 2004.

Nissan is also noted for being one of the world's leading manufacturers of automobile engines, with its VG and VQ V6 engines appearing on "Ward's 10 Best Engines" for 12 straight years - every year since the award's inception.

Nissan has produced an extensive range of mainstream cars and trucks, initially for domestic consumption but exported around the world since the 1950s. There was a major strike in 1953.

It also produced several memorable sports cars, including the Z-car, an affordable sports car originally introduced in 1969; and the Skyline GT-R, a powerful all-wheel-drive sports coupe.

Unfortunately, Nissan has been reluctant to sell most Skylines outside of Japan. However, used imports of the sportier GTS and GT-R coupes have become popular in other right-hand-drive countries like Australia.

In 1985, Nissan created a tuning division, NISMO, for competition and performance development of such cars.

Nissan sells its luxury models in North America under the Infiniti brand.

Nissan also sells a small range of keicars, mainly as a joint venture with other Japanese manufacturers like Suzuki or Mitsubishi. Nissan does not develop these cars.