Katharine Merry (born 21 September 1974) is an English former sprinter. She won the bronze medal in the 400 metres at the 2000 Sydney Olympics and was the fastest woman in the world over 400 m in 2001, with her career best of 49.59 seconds. She also represented Great Britain at the 1996 Atlanta Olympics and won the 200 metres at the 1993 European Junior Championships.