 In 2007, Gliddon represented Australia at the FIBA Under-19 World Championship in Serbia.Gliddon was in contention for the Australian Boomers' 2016 Rio Olympics team, going on to make his debut for the senior national team in 2017 at the FIBA Asia Cup, where he won a gold medal.In 2018, he helped the Boomers win gold at the Commonwealth Games.