Marcus Bai (born 11 October 1972) is a Papua New Guinean former rugby league footballer of the 1990s and 2000s. Primarily a winger, he played his final season in 2006 for English Super League team Bradford Bulls. He is the only man to win the World Club Challenge with three different clubs. Previously he played with Melbourne Storm in Australia before moving to UK. He also played for Papua New Guinea in many international matches
He retired from the game and currently runs family business.