Lieutenant Colonel John Henry Guy Nevill, 5th Marquess of Abergavenny (8 November 1914[1] – 23 February 2000), styled the Earl of Lewes from 1938–1954, was a British peer.

Lord Abergavenny was born at 43 Cadogan Square, Knightsbridge, London,[2] the eldest son of Guy Nevill and Isabel Nellie Larnach.

He rode in steeplechases between 1935 and 1939, and was elected to the National Hunt Committee in 1942, acting as a steward from 1948 to 1950, 1952–54 and 1960–62.

[6] On 4 January 1938, Lord Abergavenny married (Mary) Patricia Harrison,[3] by whom he had five children: His only son, the Earl of Lewes, died of acute anaemia at age 17.

As he had no surviving male children, he was succeeded by his nephew, Christopher Nevill, 6th Marquess of Abergavenny.