John Nugent Valentine (born 20 September 1954) is a Canadian former cricketer, a left-arm medium-pace bowler who was the first player to take a wicket for Canada in a One Day International.
In terms of batting, he was decidedly a tail-ender, and in nine matches at ODI and ICC Trophy level his highest score was 3 not out.
He played domestic cricket in Canada for Ottawa, Ontario.
Valentine appeared in Canada's runner-up 1979 ICC Trophy team with some success; he took nine wickets at 15.88, though never more than two in a single innings.
Valentine played two other matches for the outclassed Canadian team in that tournament, against England (taking the wicket of captain Mike Brearley) and Australia (claiming the scalp of Rick Darling).