| Mark Warkentin | |
| Birth Date: | November 14, 1979 |
| Birth Place: | Santa Barbara, California, U.S. |
| Height: | 6 ft 2 in |
| Weight: | 185 lb |
| Club: | Santa Barbara Swim Club |
| Collegeteam: | University of Southern California |
Mark Warkentin (born November 14, 1979) is an American open water swimmer and swimming coach.
After graduating from San Marcos High School in 1998, Warkentin attended the University of Southern California, from which he graduated in 2003 with a degree in communication. While a Trojan, he was a four-time All-American. He was also awarded USC's Willis Award as a freshman.
Warkentin qualified for the 2008 Summer Olympics in Beijing following his performance at the 2008 Open Water World Championships. In the lead-up to the Games he was noted by Time as one of its "100 Olympic Athletes To Watch." He is a two-time national champion in the open water 25-kilometer, the longest sanctioned race in the sport. The open water event at the Olympics was a 10-kilometer race, which typically lasts around two hours. Warkentin finished in eighth place with a time of 1:52:13.0, just twenty-one seconds behind winner Maarten van der Weijden.Warkentin became head coach of the Santa Barbara Swim Club on December 1, 2012, returning to lead his childhood team.