Thomas Butler, 10th Earl of Ormonde and 3rd Earl of Ossory, Viscount Thurles (c. 1531 – 22 November 1614), is an Irish peer and the son of James Butler, 9th Earl of Ormonde and Lady Joan Fitzgerald daughter and heiress-general of James FitzGerald, 10th Earl of Desmond.
He is Lord Treasurer of Ireland and a very prominent personage during the latter part of the 16th century.