Gunnar Alexander Huseby (4 November 1923 – 28 May 1995) was an Icelandic track and field athlete who competed in the shot put and discus throw events.

He reached the top levels of shot putting in 1944, throwing a mark of 15.50 m (50 ft 10 in), which ranked him fourth in the world that season (in the inter-war period).

That year he set a new Icelandic and Nordic record of 16.41 m (53 ft 10 in) in Haugesund, bettering the previous mark by Roland Nilsson of Sweden.

[1] Torfi Bryngeirsson won the men's long jump at the same tournament, making this Iceland's best ever European performance in the sport.

[6] Huseby set a lifetime best for the discus that year, throwing the implement 50.13 m (164 ft 5+1⁄2 in) to rank within the world's top twenty for that event.

[4] He was invited to the AAA Championships in England and was victorious with a throw of 15.87 m (52 ft 3⁄4 in) – the furthest distance ever thrown at the competition at that point.

[8] He developed alcoholism during this period and his approach to training and competition earned him a warning from Frjálsíþróttasamband Íslands (the national body for athletics) and an order that further bad conduct would warrant an international ban.