Glen William Vaihu (born 8 October 2001) is an Australian rugby union player who last played for the in Super Rugby. His playing position is centre or wing. He was named in the Rebels squad for the 2021 Super Rugby AU season. He made his Rebels debut in Round 2 of the 2021 Super Rugby AU season against the .
Following his release by the Rebels, Vaihu joined rugby league team Souths Logan Magpies in the Queensland Cup competition, playing four games of the 2024 season.