William Nevill, 4th Earl of Abergavenny (28 June 1792 – 17 August 1868), styled Hon. William Nevill until 1845, was a British peer and clergyman. The fourth son of Henry Nevill, 2nd Earl of Abergavenny, he was ordained in 1816 and occupied two of the family livings until 1844. He succeeded his brother as Earl of Abergavenny the following year.