Martin Daniel Trainer (born April 15, 1991) is an American-French professional golfer who won his first PGA Tour event at the 2019 Puerto Rico Open, which was an alternate event.

He graduated from Henry M. Gunn High School in Palo Alto, California in 2009.

[3] He graduated from University of Southern California with a degree in Business Administration.

[1][4] In October 2022, it was reported that Trainer had changed his sporting nationality from the United States to France, having been eligible to do so by being born in Marseille and his mother also being French.

He applied to the International Golf Federation in July 2022 to switch representation.