Mugen Motorsports (M-TEC Co., Ltd) is a Japanese company. It was formed in 1973 by Hirotoshi Honda and Masao Kimura. Hirotoshi Honda is the son of Honda Motor Company founder Soichiro Honda. Although they are closely linked with Honda, Mugen has never been owned by Honda. Mugen means "Without Limit", or "Unlimited". It is common to placed word "Power" after Mugen to say "Unlimited Power".

The company tunes and races Honda vehicles in the Super GT championship. They also sell parts to amateur racers. Mugen was involved in Formula 3000 championships in 1990 and 1991. This led Mugen to join Formula One. They supplied engines from 1992 to 2000. They also supplied the only engines for Formula Nippon from 1996 until 2005.