Swimming at the 2005 World Aquatics Championships – Women's 100 metre butterfly

Women's 100m Butterfly at the 2005 FINA World Aquatics Championships
Dates	24 July (prelims and semifinals), 25 July (final)
Winning time	57.23 seconds
Medalists
Jessicah Schipper    Australia   Libby Lenton    Australia   Otylia Jędrzejczak    Poland
← 2003 2007 →

The Women's 100 Butterfly event at the 11th FINA World Aquatics Championships swam on 24–25 July 2005 in Montreal, Canada. Preliminary and Semifinal heats swam on 24 July. The Final swam in the evening session of 25 July.

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

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