Swimming at the 2005 World Aquatics Championships – Women's 4 × 100 metre freestyle relay

The Women's 4×100 Freestyle Relay event at the 11th FINA World Aquatics Championships swam on 24 July 2005 in Montreal Canada.

At the start of the event, the existing World (WR) and Championships (CR) records were:
 * WR: 3:35.94 swum by Australia on 14 August 2004 in Athens, Greece
 * CR: 3:37.91 swum by China on 7 September 1994 in Rome, Italy