Jeff Hassler is a Canadian rugby union player. He plays at wing and occasionally at the centre position for the Seattle Seawolves in Major League Rugby (MLR), and Rugby Canada's National 15s. He has 36 caps for the National squad in all contests, and former member of the Swansea, Ospreys.Hassler is an Alberta native having attended Holy Trinity Academy in the southern foothill town of Okotoks. As a youth he excelled at all sports but in particular Canadian football and Rugby.In his rookie year as an Osprey, he appeared in seventeen matches and notched 8 tries earning him a spot on the RaboDirect Dream Team. In addition, Hassler was voted by fans and peers as Team Canada's 15's player of the year for the 2014 season. Although injury sidelined him for the majority of the 14/15 campaign, Hassler scored 6 tries in eleven appearances with the Ospreys in what was a frustrating campaign in all Guinness Pro14 (formerly Pro12) and European Cup Competitions. On 10 May 2019, it was announced that Hassler signed with the Seattle Seawolves of Major League Rugby.