Masahiro Hasemi (Shinjitai: 長谷見 昌弘, Hasemi Masahiro, born 13 November 1945 in Tokyo) is a former racing driver and team owner from Japan. He started racing motocross when he was 15 years old. In 1964 he signed to drive for Nissan. After establishing himself in saloon car and GT races in Japan, he participated in his only Formula One race at the 1976 Japanese Grand Prix for Kojima on 24 October 1976. He qualified 10th after an error which cost him his chance of a pole position and finished 11th, seven laps behind the winner. Contrary to a widely propagated but mistaken result, however, he never set a fastest lap in a Formula One championship race. Along with compatriots Noritake Takahara and Kazuyoshi Hoshino, he was the first Japanese driver to start a Formula One Grand Prix.

Hasemi became the Japanese Formula 2 champion in 1980, and got two titles in the Fuji Grand Champion Series in 1974 and 1980. After that he reverted to racing Skylines, which he became heavily synonymous with in Group 5, touring cars and JGTC. He won the Japanese Touring Car Championship in 1989, 1991 and 1992. He also won the All Japan Sports Prototype Championship in 1990, with the controversial win at the Guia Touring Car race at the Macau Grand Prix in 1990 and Daytona 24 hour in 1992. Hasemi retired from driving in 2001 and now runs NDDP Racing, a Super GT team that currently competes in the GT500 class. Hasemi also owns Hasemi Sport, a former Super GT racing team that ran under the Hasemi Motorsport banner and Nissan aftermarket parts company.

Hasemi is the most recent Japanese driver to win his home Grand Prix, winning it in 1975, when it was a non-championship race.

Note on fastest lap in Formula One

^ It was initially announced that Hasemi set the fastest lap at the 1976 Japanese Grand Prix, but it was a measurement mistake, and, several days later, the circuit issued a press release to correct the fastest lap holder of the race to Jacques Laffite. This press release was promptly made known in Japan, and the Japan Automobile Federation (JAF) and Japanese media corrected the record. But this correction was not made well known outside Japan, thus, Hasemi is credited with one fastest lap in many record books.