Cyrus Gerald Ainsworth (4 August 1888 – 20 February 1940) was an English first-class cricketer.
Ainsworth's batting style is unknown.
He was born at Bury, Lancashire.
Ainsworth qualified as a surgeon prior to 1915.
It was during World War I that he was enlisted as a surgeon in the Royal Navy in September 1915.
He continued to serve in the Royal Navy following the end of the war, as he was selected to play a first-class cricket match for the Royal Navy against Cambridge University at Fenner's in 1919.
In a match Cambridge University won by an innings and 84 runs, Ainsworth scored 6 runs in the Royal Navy's first-innings, before he was dismissed by Gordon Fairbairn, while in their second-innings he top scored with 71, before being dismissed by Gilbert Ashton.He died at Elton, Lancashire on 20 February 1940.