Swimming at the 2005 World Aquatics Championships – Women's 50 metre butterfly

The Women's 50 Butterfly event at the 11th FINA World Aquatics Championships swam 29 – 30 July 2005 in Montreal, Canada.

Preliminary[1] and Semifinals[2] heats were held on 29 July.

The Final[3] was held on 30 July.

At the start of the event, the existing World (WR) and Championships (CR) records were: Swim-off for 16th place