Margot Lumb (1 July 1912 - 3 January 1998) was a left-handed English squash and tennis player.

She was also the runner-up at the championship in 1934, when she lost to Susan Noel,[4][5] herself a British Open champion three consecutive times (1932 - 1934), winning in straight sets on all three occasions.

[7] As a tennis player, Lumb participated in the British Wightman Cup team in 1937 and 1938.

Lumb was the runner-up at the 1938 German Championships singles event, losing the final in straight sets to defending champion Hilde Sperling.

[8] Margot also competed in the main draw of the women's doubles at Wimbledon alongside her sister Berenice (Bernice) from 1937 to 1939, reaching the quarter finals in 1939.