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

The Women's 100m Backstroke at the 2007 World Aquatics Championships took place on 26 March (prelims & semifinals) and the evening of 27 March (finals) at the Rod Laver Arena in Melbourne, Australia. 87 swimmers were entered in the event, of which, 86 swam.

Existing records at the start of the event started were:
 * World Record (WR): 59.58, Natalie Coughlin (USA), 13 August 2002 in Fort Lauderdale, USA.
 * Championship Record (CR): 1:00.00, Natalie Coughlin (USA), Montreal 2005 (30 July 2005)

Finals
Note: Coughlin's 50m split of 28.30 in the Final, established a new Championship Record for the distance. The existing CR for the distance had been 28.31 by China's Gao Chang from Montreal 2005.