Brendan Ashby (born June 30, 1980) is a Zimbabwean former swimmer, who specialized in backstroke events.

[1] Since 2004, Ashby currently holds two Zimbabwean records in the 100 and 200 m backstroke from the World championships and U.S. invitational meets.

Ashby qualified for the men's 100 m backstroke at the 2004 Summer Olympics in Athens, by eclipsing a FINA B-standard entry time of 58.28 from the USA Swimming Grand Prix in Indianapolis, Indiana.

[3][4] He challenged seven other swimmers on the second heat, including Olympic veterans Nicholas Neckles of Barbados, George Gleason of the Virgin Islands, and Sung Min of South Korea.

Swimming in lane one, Ashby raced to sixth place by a 1.27-second margin behind Gleason in 58.91.