Liang Xu (?-?) was an offiucer under Tian Shui Prefect, Ma Zun. When Zhuge Liang invaded Tian Shui suspicion was cast on him after his friend Jiang Wei defected to Shu. Fearing reprisal, he opened Tian Shui's gates and welcomed the Shu Army. He was later assigned to the post of Tian Shui Prefect.