Willum Þór Þórsson (born 17 March 1963) is an Icelandic former football player and manager and politician.

He holds a Master's degree in Microeconomics from the University of Copenhagen and used to teach economics at Menntaskólinn í Kópavogi.

He took charge of Valur who had just been promoted to the Úrvalsdeild and finished the 2005 season in 2nd place after champions FH.

In November 2010, Willum was appointed as the first manager for the Icelandic futsal team.

[3] Willum married to Ása Brynjólfsdóttir, with whom he has five children, which includes Willum Þór Willumsson, an Icelandic international footballer, as well Brynjólfur Andersen Willumsson, an Icelandic youth international footballer.