Gustav "Måsen" Björk (10 July 1900 – 12 May 1928) was a Swedish football player, best known for being a prolific goalscorer for Hammarby IF.

[2][3][4] Björk soon became known as a prolific goalscorer and established himself as one of Hammarby's key players, together with goalkeeper Victor Olsson and defender Gösta Wihlborg.

[7] The same year, Björk won two caps for the Sweden men's national football team, featuring in two 0–3 losses against Norway and Finland[8][6] In 1922, Hammarby had an other strong showing where they went to the finals of Svenska Mästerskapet, a cup by then held to decide the Swedish champion, losing 1–3 to GAIS in a game where Björk scored the consolidation goal.

[9][4] In 1924, Hammarby IF was one of the founding members of Allsvenskan, a new league that was established to determine the Swedish champion.

[12][10][6] In 1921, the club founded their ice hockey department, and on 7 March the same year, Björk became the very first goalscorer for Hammarby IF in a 7–5 win against IF Linnéa.