Teemu Tainio (Finnish pronunciation: [ˈteːmu ˈtɑinio], born 27 November 1979 in Tornio) is a Finnish footballer, who currently plays for New York Red Bulls in Major League Soccer.

He can play both as a defensive and attacking midfielder and out wide. Tainio also played at right-back under Juande Ramos at Tottenham.

Tainio was promoted to the first team of his home-town club TP-47 in Kakkonen, Finland's third division, at the age of fourteen. He was signed by Veikkausliiga club FC Haka for the 1996 season. Following a trial at Manchester United in March 1997, Tainio joined French club AJ Auxerre in 1997, and spent eight years at the club. He won the Coupe de France with Auxerre twice, and also gained UEFA Champions League experience. While with Auxerre, Tainio appeared in 204 official matches and scored 19 goals.

With Tainio's contract with Auxerre due to expire in 2005, he became available on a free transfer. In January 2005, it was announced that he would move to Tottenham Hotspur on a seven-year deal in the summer of 2005. He became a regular for Spurs in his first season, playing in various midfield positions.