Judith Brenda Grinham, (born 5 March 1939), also known by her married name Judith Rowley, is an English former competitive swimmer who represented Great Britain in the Olympics and European championships, and competed for England in the Commonwealth Games.
Grinham is an Olympic gold medallist, Commonwealth and European champion, and former world record-holder.
In 1956 and 1958 she was chosen as Great Britain's Sportswoman of the Year.
In 1958 she became the first woman to win Olympic, European and Commonwealth titles.