Liang Xu was an officer under the Wei army and later submitted to Zhuge Liang, being made Governor of Tian Shui. He was a minister of the state of Cao Wei during the Three Kingdoms period of Chinese history. Liang served in Tianshui Commandery and was an old friend of Jiang Wei. He surrendered to the rival state of Shu Han later and was appointed Prefect of Tianshui.