Ungmennafélagið Skallagrímur, known as UMF Skallagrímur or just Skallagrímur, is a multi-sports club from Borgarnes, Iceland. It was founded on 3 December 1916. Each sport has its own division with a separate board, football, basketball, badminton, swimming, weightlifting and athletics. Unusually for a sports club, there is a non-sport division, for acting (theatre), with the club staging a play every year.