Guðmundur Ágúst Kristjánsson (born 7 October 1992) is an Icelandic professional golfer and European Tour player.

[2] He played his first event abroad in 2007 when he was 14, and three years later he won the Duke of York Young Champions Trophy at Royal St George's Golf Club in England.

[2] He roomed with Adrian Meronk and won multiple times, and represented the school in the NCAA National Championship.

[4][1] In his rookie year on the Challenge Tour, he finished fifth at the Northern Ireland Open, and became the highest ranked Icelandic golfer on the Official World Golf Ranking, as he overtook Haraldur Magnús.

[1] Source:[7] *Christensen and Kristjánsson agreed to share the 2019 PGA Championship (NGL) after unsafe conditions caused play to halt after three holes of a playoff.