Rickard Deasy PC (1812 – 6 May 1883) was an Irish lawyer and judge. He was born at Phale Court, Enniskean, County Cork, the second son of Rickard Deasy, a wealthy brewer, and his wife Mary Anne Caller. He was educated at the Trinity College Dublin, where he graduated with a Doctorate of Law. He was called to the Irish Bar, and became Queen's Counsel. He practised mainly on the Munster Circuit, and quickly became one of its leaders.