Mark Kerr (1.87 m - 116 kg), born December 21, 1968, in Toledo, Ohio, nicknamed "The Smashing Machine," is an American freestyle wrestler and former wrestling champion. He was ranked number one in the world from 1997 to 2000, before his career slowly declined.

Mark Kerr was originally a wrestler. He became the NCAA college wrestling champion in 1992, then the FILA amateur freestyle wrestling champion in 1994. From 1999 to 2001, he won every heavyweight grappling competition organized by the Abu Dhabi Combat Club. Kerr began freestyle wrestling in 1997. He is notably famous for winning the UFC 14 heavyweight tournament on March 13, 1997, and the UFC 15 heavyweight tournament on October 17, 1997. He has also fought at Pride. World number one in freestyle wrestling from 1997 to 2000, feared for his wrestling and knee strikes, he subsequently suffered two defeats and disappeared from the freestyle scene. Drugged and addicted to painkillers, he underwent rehab. His return three years later proved disastrous, as Kerr was unable to regain his early career level and suffered numerous defeats, each time in the first round.

In 2003, HBO released a documentary entitled "The Smashing Machine: The Life and Times of Mark Kerr," a film that follows Kerr in his training and professional fights, revealing his addiction to painkillers. Ken Shamrock, Bas Rutten, and Mark Coleman also appear in the film.

On June 26, 2025, Mark Kerr was inducted into the Ultimate Fighting Championship (UFC) Hall of Fame. The honorary trophy was presented to him by Dwayne Johnson, who plays his role in the biopic "The Smashing Machine," directed by Ben Safdie, scheduled for release in October 2025.