Colin Leslie McCool was an Australian cricketer who played in 14 Test matches between 1946 and 1950. McCool, born in Paddington, New South Wales, was an all-rounder who bowled leg spin and googlies with a round arm action and as a lower order batsman was regarded as effective square of the wicket and against spin bowling. He made his Test début against New Zealand in 1946, taking a wicket with his second delivery. He was part of Donald Bradman's Invincibles team that toured England in 1948 but injury saw him miss selection in any of the Test matches.

The Australian cricket team in England in 1948 is famous for being the only Test match side to play an entire tour of England without losing a match. This feat earned them the nickname of "The Invincibles", and they are regarded as one of the greatest cricket teams of all time. According to the Australian federal government, the team "is one of Australia's most cherished sporting legends". The team was captained by Don Bradman, who was making his fourth and final tour of England.