The men's 4×100 metre freestyle relay at the 2007 World Aquatics Championships took place on 25 March 2007 at the Rod Laver Arena in Melbourne, Australia. The top-12 finishers from this race qualified for the event at the 2008 Olympics. 35 teams entered in the event, of which 34 swam. The existing records when the event started were: * World record (WR): 3:12.46, USA (Phelps, Walker, Jones, Lezak), 19 August 2006 in Victoria, Canada. * Championship record (CR): 3:13.77, USA (Phelps, Walker, Dusing, Lezak), Montreal 2005 (24 July 2005)