Mihai Leu also known as Michael Loewe (born 13 February 1969, in Hunedoara) is a Romanian former professional boxer who competed between 1991 and 1997. He held the WBO welterweight title in 1997.

Leu retired after one title defense, against Michael Carruth, becoming the third European boxer to retire as an undefeated world champion, after Jack McAuliffe and Terry Marsh. Due to an injury, he was forced to abandon boxing but unwilling to give up the world of sports, he turned to be a rally driver. He later became a national rally champion.

In 1998 he started his new career at the wheel of a Ford Ka and after only three years, he managed to become Romania's rally vice-champion. He had already participated in rallying before, having made his debut in 1994, at the Banat Rally, in a Volkswagen Golf GTI.

Five years later, in 2003, he became Romania's national champion driving a Hyundai Accent WRC, with co-driver Ciprian Solomon. After failing to win another race af