The men's 100 metre backstroke at the 2007 World Aquatics Championships took place on 26 March (heats and semifinals) and the evening of 27 March (final) at the Rod Laver Arena in Melbourne, Australia.
At the 2007 World Aquatics Championships, the men's 100 metre backstroke event was held over two days: heats and semifinals on 26 March, followed by the final on the evening of 27 March at the Rod Laver Arena in Melbourne, Australia.