Henry William John Byng, 4th Earl of Strafford KCVO CB (21 August 1831 – 16 May 1899) was a British peer and courtier.

On 28 March 1898, his elder brother George Byng, 3rd Earl of Strafford, died and he succeeded to his peerages and estates and his seat in the House of Lords.

On 15 October 1863, Strafford married Countess Henrietta Louisa Elizabeth Danneskiold-Samsøe (a maternal granddaughter of the 1st Marquess of Ailesbury) and they had four children: His first wife died in 1880.

Strafford was buried in a family vault in the churchyard of St John's, Potter's Bar, with his first wife.

In 1935, after the church had become disused and prone to vandalism, the bodies were exhumed and moved to a mausoleum at the nearby family estate of Wrotham Park.