Earl of Castlehaven was a title in the Peerage of Ireland, created on 6 September 1616.

Upon the attainder and execution of the second earl for sodomy, under the Buggery Act 1533 in 1631, he forfeited his English peerage, but not his Irish titles; this was because his English barony of Audley had been created for heirs general, but his Irish earldom and barony was an entailed honour protected by statute De Donis.

His son, the third earl, was created Baron Audley of Hely on 3 June 1633 by letters patent, with the precedence of his grandfather, in an attempt to restore to him the original Barony of Audley.

However, this was deemed insufficient to do so; a bill was passed in Parliament in 1678 which allowed him to inherit the original Barony despite the attainder.

Within months he was barred from the House of Lords as a Roman Catholic under the Second Test Act.