Birgir Leifur Hafþórsson (born 16 May 1976) is an Icelandic professional golfer and former European Tour player.

At age 41, he became Iceland's first winner on the Challenge Tour, winning the 2017 Cordon Golf Open in France.

His best finish in his rookie season was a tie for 11th at the Telecom Italia Open, 3 strokes behind winner Gonzalo Fernández-Castaño.

He suffered from spondylolisthesis, a condition in which a defect in a part of the spine causes vertebra to slip, and played the European Tour on a medical extension in 2009.

[4] Hafþórsson represented Iceland at the 2018 European Golf Team Championships at Gleneagles, Scotland.