The Women's 50 Breaststroke event at the 11th FINA World Aquatics Championships swam 30 – 31 July 2005 in Montreal, Quebec, Canada. Preliminary and Semifinal heats were swum on 30 July with the heats being held in the morning session[1] and the semifinals being held in the evening session.[2] The final was held on 31 July.[3]