Katy Sexton, MBE (born 21 July 1981) is a former Olympic swimmer from Great Britain. She became the first British swimmer to win a World Championship title, when she won the Women's 200m Back at the 2003 World Championships. She is twice an Olympian and has represented Great Britain in four World Championships, the first in 1998 when she was 16, and in three Commonwealth Games. She was given the MBE for services to swimming in the 2004 New Year Honours list.