John Beresford, 4th Marquess of Waterford

Reverend John de la Poer Beresford, 4th Marquess of Waterford (27 April 1814 – 6 November 1866) was an Irish peer and Church of Ireland minister.

Beresford was the third son of the Henry Beresford, 2nd Marquess of Waterford and his wife, Susanna. He was educated at Eton and Trinity College, Cambridge. He later entered the ministry and was the incumbent of Mullaghbrack, County Armagh and a Prebendary of St Patrick's Cathedral, serving under his uncle, Lord John.

On 20 February 1843, he married Christiana Leslie (a relative of the Leslie Baronets) and they had five sons:

Beresford inherited the marquessate from his childless brother in 1859. On his own death in 1866, the title passed to his eldest son, John.