Brian Lawrence Johns (born August 5, 1982) is a former competition swimmer from Canada.

[1] Born in Regina, Saskatchewan, he grew up in Richmond, British Columbia and trained with the Aquanauts and Racers (later Rapids) swim clubs.

He attended the University of British Columbia, where he was a member of the UBC Thunderbirds varsity swimming team.

He held the world record in the 400-metre individual medley (short-course), with a time of 4:02.72.

He was a member of the Canadian team that finished in fifth place in the 4x200-metre freestyle relay at the 2008 Summer Olympics in Beijing.