Baron Inchiquin (Irish: Barún Inse Uí Chuinn) is one of the older titles in the Peerage of Ireland. It was one of two titles created on 1 July 1543 for Murrough O'Brien, Prince of Thomond, who was descended from the great high king Brian Boru. The grant of the English titles was conditional upon the abandonment of native titles, the adoption of English customs and laws, pledging of allegiance to the English crown, apostasy from the Catholic Church, and conversion to the Anglican Church. Murrough was made both Earl of Thomond in the Peerage of Ireland, with remainder to his nephew Donough O'Brien and Baron Inchiquin, with remainder to his male heirs.