Swimming at the 2005 World Aquatics Championships – Men's 50 metre breaststroke

The Men's 50 Breaststroke event at the 11th FINA World Aquatics Championships swam 26 and 27 July 2005 in Montreal, Canada. Preliminary and Semifinal heats were on 26 July; the final was held on 27 July.

Prior to the competition, the existing World (WR) and Championships (CR) records were:
 * WR: 27.18 swum by Oleg Lisogor (Ukraine) on 2 August 2002 in Berlin, Germany;
 * CR: 27.46 swum by James Gibson (Great Britain) on 22 July 2003 in Barcelona, Spain.