Joan Cowell O'Meara Ridley (11 July 1903 – 4 October 1983) was a female British tennis player who was active in the 1920s and 1930s.

Ridley was a semifinalist at the 1931 Wimbledon Championships where she lost in straight sets to Helen Jacobs.

The same year her best Grand Slam result was reaching the final of the mixed doubles event at the 1929 Wimbledon Championships with compatriot Ian Collins, losing in three sets to the Americans Anna Harper and George Lott.

In 1930 she won the singles title at the British Covered Court Championships, played at the Queen's Club in London, after defeating Joan Fry in the final in straight sets.

[6][7][8] In 1931 and 1932 she reached the finals of the Middle States Championships, but lost on both occasions to Elsie Goldsack Pittman.