Infiniti is Japanese Nissan Motor's, now part of French autogiant Renault, luxury automobile brand in the United States, Canadian, Middle Eastern, South Korean and Taiwanese markets. Nissan also has plans to release Infiniti into many European markets, China, as well as in Japanese market in the coming years.

Infiniti vehicles are traditionally based on the same automobile platform as Nissan models. In some cases, similar vehicles are sold as upscale Nissans in the same market, while other Infinitis are rebadged models from the Japanese market, where Nissan's model range includes high-end luxury vehicles. More recently, the differentiation between Nissan and Infiniti vehicles has become greater, and even where two models may share a similar platform, Infinitis tend to feature more powerful engines, tuned suspensions, steering systems, and more luxurious interior appointments.

Infiniti began to take part of the luxury market mostly thanks to its popular Q45. The vehicle included a class leading (at the time) 278 hp (207 kW)V8 engine, four-wheel steering, the first active suspension system offered on a motor vehicle, and numerous interior luxury appointments. These made it competitive against the comparatively uninspiring engines and interiors found in German imports like BMW and Mercedes-Benz, which by the time of Infiniti's release had overtaken Cadillac and Lincoln in dominating the luxury segment of the American market.

By the late 1990s, however, Infiniti was consistently behind Lexus and even struggling Acura in sales. The Q45 had retreated considerably from its focused, taut rendition of a executive sedan, having become a barely recognizable, ponderously-handling sedan that earned the nickname "The Japanese Lincoln." Infiniti's other offerings, the Maxima-based I30 and the strange-looking J30 never garnered strong followings, and the company, bereft of an image or a following, floundered.

By the early 2000s, Infiniti was facing extinction. Its own impending doom being perhaps the best motivator, the company rededicated itself to developing a dynamic and powerful line-up of sporty luxury cars. Car and Driver reported that Infiniti executives invited members of the motoring press to a meeting where they "swore never again to take their eyes off BMW." Although this effort began with a completely redisigned Q45 flagship for the 2002 model year, it was the G35 that finally turned sales around for Infiniti in 2003. A compact sports sedan far exceeding the capabilities of its Nissan Primera-based predecessor (the G20), the Nissan Skyline-based G35 became an instant hit. The release of the sport tuned FX45 sport utility vehicle piggybacked on the G35's success. The FX45 combined sports-car handling and performance with station wagon-like versatility and all-weather capability.

Today, Infiniti's sales and reputation continue to increase impressively as Carlos Ghosn follows through on his vision to break Infiniti away from its Nissan roots. The G35 series helped re-define Infiniti as the "Japanese BMW", an image it continues to cultivate. This reputation has been enhanced by the FX35/FX45 SUV, and the redesigned M35/M45 for the 2006 model year. The M35/M45 has already garnered impressive acclaim from the automotive press, winning an eight-car comparison test in Car and Driver, and has proven very popular in its first few months of sales.