The Men's 200 Butterfly event at the 11th FINA World Aquatics Championships was swum on 26 – 27 July 2005 in Montreal, Canada.

The Preliminary and Semifinal heats were on 26 July; the final was held on 27 July.

As the Championships were swum in a long course pool, this race consisted of 4 lengths of the pool, butterfly.

At the start of the event, the existing World (WR) and Championships records were: