Swimming at the 2007 World Aquatics Championships – Women's 100 metre butterfly

The Women's 100m Butterfly at the 2007 World Aquatics Championships took place on 25 March (prelims & semifinals) and the evening of 26 March (finals) at the Rod Laver Arena in Melbourne, Australia. 75 swimmers were entered in the event, of which 74 swam.

Existing records at the start of the event were:
 * World Record (WR): 56.61, Inge de Bruijn (Netherlands), 17 September 2000 in Sydney, Australia.
 * Championship Record (CR): 57.23, Jessicah Schipper (Australia), Montreal 2005 (25 July 2005)