Tetratema (27 April 1917 – July 1939) was an Irish-bred, British-trained Thoroughbred racehorse and sire. In a racing career which lasted from May 1919 until October 1921 he won thirteen of his sixteen races, include the all twelve of his starts over the sprint distances of five and six furlongs. He was unbeaten in five races in 1919, including the Molecomb Stakes, Champagne Stakes, and Middle Park Stakes, and was the highest-rated two-year-old in Britain by a record margin.