Mary Anne Cotterill (born 16 October 1945) is a retired English butterfly swimmer.

She won two bronze medals in the 4 × 100 m medley relay at the 1962 and 1966 European Aquatics Championships.

In the 110 yd butterfly she was second to the world record holder Mary Stewart of Canada.

[3] She represented England and won two silver medals in 110 yards butterfly and the medley relay, at the 1962 British Empire and Commonwealth Games in Perth, Western Australia.

[4][5] At the ASA National British Championships she won the 110 yards butterfly title in 1964.