William Crosbie, 1st Earl of Glandore (May 1716 – 11 April 1781), known as The Lord Brandon between 1762 and 1771 and as The Viscount Crosbie between 1771 and 1776, was an Irish politician. Crosbie was the son of Maurice Crosbie, 1st Baron Brandon, by Lady Elizabeth Anne, daughter of Thomas FitzMaurice, 1st Earl of Kerry. He was elected at Trinity College Dublin.