Alexander Fraser, 4th Lord Lovat (1527 – 1557/1558) was a Scottish peer and Chief of Clan Fraser of Lovat from 1544 until 1557. He succeeded to the chiefship in July 1544, aged seventeen, after his father Hugh Fraser, 3rd Lord Lovat and elder brother Simon were killed in the battle of Loch Lochy. He was made the legal ward of Robert Reid, Bishop of Orkney (d. 1558), who was a relative of his mother's. In 1555 he waited on Mary of Guise when she came to Inverness to hold assizes. He died of rheumatism in 1557/1558.