The men's 50 metre breaststroke event at the 2005 World Aquatics Championships took place between 26 July – 27 July. The heats and semifinals were held on 26 July. The final was held on 27 July.

Records

Prior to the competition, the existing world and championship records were as follows.

	Name	Nationality	Time	Location	Date
World record	Oleg Lisogor Oleg Lisogor Oleh Lisohor is a Ukrainian swimmer.Born in Brovary, Kiev Oblast, Soviet Union , Lisogor is the former world record holder in the 50 metres breaststroke, long course, with 27.18 seconds. The record was set in Berlin on 2 August 2002...	Ukraine Ukraine Ukraine is a country in Eastern Europe. It has an area of 603,628 km², making it the second largest contiguous country on the European continent, after Russia...	27.18	Berlin Berlin Berlin is the capital city of Germany and is one of the 16 states of Germany. With a population of 3.45 million people, Berlin is Germany's largest city. It is the second most populous city proper and the seventh most populous urban area in the European Union...	2 August 2002
Championship record	James Gibson James Gibson (swimmer) James Gibson MBE is an English swimmer.Born in Chelmsford, Essex, and raised in Witham, Gibson's specialism is breaststroke and he competes in the 50 metre, 100 metre and 200 metre events. In 2003 he became world champion at 50 metres . He was 6th in the 100 metre event at the Athens Olympics in...	Great Britain Great Britain Great Britain or Britain is an island situated to the northwest of Continental Europe. It is the ninth largest island in the world, and the largest European island, as well as the largest of the British Isles...	27.46	Barcelona Barcelona Barcelona is the second largest city in Spain after Madrid, and the capital of Catalonia, with a population of 1,621,537 within its administrative limits on a land area of...	22 July 2003

No new world or competition records were set during this competition.

Final

Rank	Name	Nationality	Time	Notes
	Mark Warnecke Mark Warnecke Mark Warnecke is a German former breaststroke swimmer who, at age 35, won the world title in the 50 m breaststroke at the 2005 World Aquatics Championships in Montreal, Canada. That made him the oldest swimming world champion since 1971...		27.63
	Mark Gangloff Mark Gangloff Mark Gangloff is an American swimmer who earned a gold medal at the 2004 Summer Olympics by swimming in the 4x100m medley relay preliminaries. He came in fourth place for the 100m breaststroke...		27.71
	Kosuke Kitajima Kosuke Kitajima is a Japanese multiple Olympic gold medalist breaststroke swimmer. He won gold medals for the men's 100 m and 200 m breaststroke at both the Athens 2004 and Beijing 2008 Olympics.-Major achievements:...		27.78
4	Hugues Duboscq Hugues Duboscq Hugues Duboscq is an Olympic breaststroke swimmer from France. He swam for France at the 2000, 2004 and 2008 Olympics. He has won three Olympic bronze medals....		27.87
5	Chris Cook Chris Cook Chris Cook may refer to:* Chris Cook , NASCAR racing driver and instructor* Christopher Cook, English swimmer* Christopher Cook , American journalist* Chris Cook , professional bodybuilder...		28.00
6	Valeriy Dymo		28.03
6	Emil Tahirovic Emil Tahirovic Emil Tahirovič is an Olympic breaststroke swimmer from Slovenia. He swam for Slovenia at the 2000 and 2004 Olympics.He swam for Slovenia at:*Olympics: 2000, 2004*Mediterranean Games: 2005, 2009...		28.03
8	Brenton Rickard Brenton Rickard Brenton Scott Rickard is a breaststroke swimmer from Australia. He emerged at the international level in 2006, swimming at the Commonwealth games...		28.27