Stein Stugu (born 25 January 1953) is a Norwegian trade unionist and politician for the Red Electoral Alliance. He grew up in Stabekk as a son of pianist . He joined the Workers' Communist Party in the 1970s, and started his career at in 1977. He later made a name as a trade unionist within the breweries system. In 1990 he became the employees' representative in the board of Ringnes, which bought Frydenlund, and later the Orkla Group since 1994 after it bought Ringnes. He left Orkla when it sold Ringnes in 2004, then he also left Ringnes in 2006. In 2005 he lost a vote for secretary of the Norwegian Union of Food, Beverage and Allied Workers.