Tapani Niku (born "Karsikas", 1 April 1895 – 6 April 1989) was a Finnish cross-country skier who competed at the 1924 Winter Olympics. He won a bronze medal in the 18 km event and failed to finish his 50 km event. At the FIS Nordic World Ski Championships 1926 he placed sixth over 50 km and 13th over 18 km.