Tuomas Juhani Haapala (born 20 April 1979) is a Finnish former footballer who ended his career after 2010.

Haapala has previously played for FC Lahti (2000–03) and MyPa (2004–05) in the Finnish Veikkausliiga.

After an excellent 2005 season, Haapala was invited for a trial with Manchester City.

After two weeks at the club, manager Stuart Pearce decided to offer him a contract to the end of the 2005–06 season.

Haapala played his first game for the Finnish national team on 12 October 2005 against Estonia.