Glenn O'Shea (born 14 June 1989, Swan Hill) is an Australian track cyclist who won the Omnium at the 2012 UCI Track Cycling World Championships. He was also a member of the Australian team that won silver in the team pursuit at the 2012 World Championships and the 2012 Olympics.

O'Shea briefly quit cycling as an under-23 in 2010 after contracting a severe case of glandular fever. However, after a representing the Australia in team pursuit and omnium in both the Worlds and the Olympics in 2012, he joined the An Post–Chain Reaction continental cycling team for 2013. A third place at Ronde de l'Oise, in which he celebrated a stage win and wore the leader's jersey led to interest from Garmin–Sharp for whom he rode in the 2013 World Ports Classic. He started the 2013 Tour of Britain as lead-out man for Steele Von Hoff.

He remained with An Post–Chain Reaction into 2014. In 2014, he won gold in the men's team pursuit (in a new Games record) and silver in the men's scratch race at the 2014 Commonwealth Games. In November 2014 O'Shea was announced as part of the Team Budget Forklifts line-up for 2015 alongside fellow members of the Australian endurance track squad Luke Davison, Jack Bobridge, Scott Sunderland and Mitchel Mulhearn, riding a domestic programme with a focus on achieving success on the track at the 2016 Summer Olympics. O'Shea signed for ONE Pro Cycling for 2016.