Florence Angela Margaret Mortimer Barrett (born 21 April 1932) is a former World No. 1 British female tennis player. She was born in Plymouth, Devon, England. She is married to the veteran BBC commentator John Barrett.
Mortimer teamed with Anne Shilcock to win the women's doubles title at Wimbledon in 1955. That was Mortimer's only career Grand Slam women's doubles title. She teamed with Coghlan to reach the women's doubles final at the 1958 Australian Championships.
Mortimer and Peter Newman reached the mixed doubles final at the 1958 Australian Championships. That was her only career Grand Slam mixed doubles final.
According to Lance Tingay of the Daily Telegraph and the Daily Mail, Mortimer was ranked in the world top ten from 1953 through 1956 and from 1958 through 1962, reaching a career high of World No. 1 in those rankings in 1961.