Kolbeinn Birgir Finnsson

Fylkir

A midfielder, Kolbeinn began his career in his native Iceland in the Fylkir academy. His progression was such that he became the club's youngest-ever player when he made his debut at age 14 years and 229 days in a 3–0 group stage League Cup victory over Þróttur on 11 April 2014. Kolbeinn signed a new 2+1⁄2-year contract on 2 May 2015, he became the youngest player in the club's history to start a Úrvalsdeild match, when he made a late substitute appearance in a 1–1 draw with Fjölnir. Kolbeinn made 15 appearances during the 2015 season and departed the Fylkisvöllur in January 2016.

FC Groningen

On 27 October 2015, Kolbeinn moved to the Netherlands to join Eredivisie club FC Groningen on a 2+1⁄2-year contract, effective 1 January 2016. The transfer made him the youngest player to sign a contract with the club. He began his time with the club in the U17 and U19 teams, before progressing into the U23 team, for whom he made 24 Derde Divisie appearances during the 2016–17 and 2017–18 seasons. Kolbeinn was released when his contract expired at the end of the 2017–18 season.

Brentford

On 8 June 2018, Kolbeinn moved to England to transfer to the B team at Championship club Brentford. He signed a two-year contract, with the option for a further year, effective 1 July 2018. After making his international debut for Iceland in January 2019, Kolbeinn became Brentford B's first ever player to win an international cap without having yet made a first-team…

At youth international level, Kolbeinn was capped by the Iceland U16, U17, U19 and U21 teams. He was a part of the U16 squad which won the bronze medal at the 2014 Summer Youth Olympics. Kolbeinn was a member of Iceland's 2021 UEFA European U21 Championship finals squad and he made three appearances prior to the team's group stage exit. Kolbeinn received his maiden call into the senior squad for a pair of friendly matches in Qatar in January 2019. He appeared in both, but was not called into the squad again until a pair of Euro 2024 qualifiers in September 2023. Kolbeinn appeared in both matches, which marked his competitive debut for the senior team.

Club

As of match played 16 July 2026

International

As of match played 11 October 2024

Kolbeinn is the son of retired international footballer Finnur Kolbeinsson.