Kathryn Elise Hoff is a former American competitive swimmer, she is an Olympic medalist, and former world record-holder. Hoff was known for her success in the 200-meter and 400-meter individual medley. She represented the United States at the 2004 Summer Olympics and 2008 Summer Olympics, in which she was awarded a silver medal and two bronze medals.

The 2005 World Aquatics Championships or the XI FINA World Championships were held in Montreal, Quebec, Canada from July 16 to July 31, 2005. They took place in Parc Jean-Drapeau on Saint Helen's Island.