Grahame Thomas (born 21 March 1938, in Croydon Park, New South Wales) is a former Australian cricketer who played in eight Tests in 1965 and 1966. After several seasons in which he established a reputation as a hard-hitting batsman for New South Wales in the Sheffield Shield, he made his Test debut a few days short of his 27th birthday against the West Indies in 1965. He played all five Tests in that series without notable success, and returned to the Test side in the 1965–66 Ashes series when Bobby Simpson was injured, making two fifties in the last three Tests of the series.