Sir Tristram Beresford, 1st Baronet (died 15 January 1673) was an Irish soldier and politician. He is ancestor of the Marquesses of Waterford, the Barons Decies and the Beresford Baronets, of William Beresford, 1st Viscount Beresford and Charles Beresford, 1st Baron Beresford.
He was the eldest son of Tristram Beresford, who originated from Kent and had settled in Ireland, and his wife Susannah Brooke. Beresford entered the Irish House of Commons in 1634, sitting for Londonderry County in this year. He represented the constituency again from 1656 until 1658 and stood successfully a third time in 1661, a seat he held for the next five years. Beresford was knighted in 1664 and was created a Baronet, of Coleraine, in the County of Londonderry on 5 May of the following year.
He married firstly Anne Rowley, oldest daughter of John Rowley, and had by her a son and two daughters. After her death Beresford remarried Sarah Sackville. By his second wife he had another three sons and three daughters. Beresford died on 18 January 1673 and was buried in Coleraine five days later. He was succeeded in the baronetcy by his son Randal.