Birger Maertens (born 28 June 1980) is a Belgian former professional footballer who played as a centre back.

He played his first game on 9 August 2001 against Icelandic side IA Akranes (4–0) in the UEFA Cup.

In 2009 Birger Maertens was voted 8th best overall player in the Eredivisie by Dutch football magazine Voetbal International.

[2] On 6 January 2012, it was announced he had left Heracles earlier than planned, for personal reasons, to return to his native Belgium, and would not see out the rest of his contract.

On 12 October 2005, Maertens collected his first cap for the Belgium national team in the qualification stages for the 2006 FIFA World Cup against Lithuania (1–1).