Thomas Kahlenberg (born 20 March 1983) is a former Danish footballer.
He started his career with Brøndby IF, winning two Danish Superliga championship, and played four seasons at French club Auxerre.
He has played 46 games and scored 5 goals for the Danish national team, and represented Denmark at the 2004 European Championship, 2010 FIFA World Cup and 2012 European Championship.
He was named 2004 Danish under-21 Player of the Year.
He is currently working as a youth coach at HIK.