Swimming at the 2007 World Aquatics Championships – Women's 4 × 100 metre freestyle relay

The Women's 4 × 100 m Freestyle Relay at the 2007 World Aquatics Championships took place on 25 March 2007 (prelims and final) at the Rod Laver Arena in Melbourne, Australia. The top-12 finishers from this race qualified for the event at the 2008 Olympics.

The existing records when the event started were: