Martin Bjørnbak (born 22 March 1992) is a Norwegian footballer who plays as a defender for Eliteserien club Molde.
Born in Mo i Rana, Bjørnbak started his career at local club Stålkameratene before he joined Bodø/Glimt ahead of the 2011 season. In his first season with Bodø/Glimt, Bjørnbak played 23 matches and scored one goal in the 1. divisjon, before transferring to Haugesund where he signed a four-year contract. Bjørnbak made his debut in the Tippeligaen in the match against Vålerenga on 25 March 2012, but was sent off after 33 minutes when he fouled Marcus Pedersen as the last man. Bjørnbak played a total of 17 matches for Haugesund in his first season.
On 17 January 2019 Bjørnbak signed a four year contract with Molde. He got his Molde debut on 31 March 2019 in a 1–1 away draw against Sarpsborg 08.
Bjørnbak first appeared for Norway at international level when he played three matches for the under-17 team in 2009. In 2012, Bjørnbak again represented his country when he played ten matches for the under-21 team.
- As of match played 24 November 2019
- Eliteserien: 2019