Willum Þór Willumsson

BATE Borisov

Willum signed with BATE Borisov in February 2019. In February 2022, he signed a six-month extension with the club.

Go Ahead Eagles

In July 2022, he joined Go Ahead Eagles in the Eredivisie.

Birmingham City

On 19 July 2024, recently relegated League One (third-tier) club Birmingham City signed Willum on a four-year contract. The fee was undisclosed. He made his debut in the starting eleven for the opening fixture of the season, a 1–1 draw at home to Reading, but left the field just after half-time after aggravating a knee problem.

NEC

On 1 February 2026, Willumsson returned to the Netherlands to join NEC on a two-and-a-half-year deal for an undisclosed fee.

Willum made his debut for the Iceland national team on 15 January 2019 in a friendly against Estonia, coming on as a 69th-minute substitute for Jón Dagur Þorsteinsson.

Club

As of match played 8 September 2026

International

As of match played 31 May 2026

Willum is the son of Willum Þór Þórsson, a former football player and manager, former member of the Icelandic parliament and was Minister of Health. He is the brother of fellow footballer Brynjólfur Willumsson, who plays for Groningen.