Tuomas Oskar Grönman (born 22 March 1974 in Viitasaari, Finland) is a Finnish retired professional ice hockey defenceman. He played 2 seasons in the National Hockey League (NHL) with the Chicago Blackhawks and Pittsburgh Penguins organizations. He also played in the SM-Liiga for TPS, Lukko and Jokerit. He won a bronze medal with Team Finland at the 1998 Winter Olympics.