John Wandesford, 1st Earl Wandesford(24 May 1725 – 12 January 1784) was an Anglo-Irish peer.
Wandesford was the son of George Wandesford, 4th Viscount Castlecomer and Susannah Griffith, daughter of Reverend John Griffith and Susannah Cross, and great-granddaughter of Edward Worth, Bishop of Killaloe. He succeeded to his father's viscountcy on 25 June 1751, and took his seat in the Irish House of Lords on 22 November that same year.He was elevated on 1 August 1758 when he was created Earl Wandesford in the Peerage of Ireland.
He was elected a Fellow of the Royal Society on 4 April 1774.
He married Agnes Elizabeth Southwell, daughter of John Southwell of Enniscourt, County Limerick and Sarah Rose, daughter of Henry Rose, justice of the Court of King's Bench (Ireland), on 11 August 1750. Together they had a son and a daughter. His son predeceased him, and Wandesford's titles became extinct upon his death.His daughter Frances married John Butler, 17th Earl of Ormonde.
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Viscount Castlecomer was a title created on 15 March 1707, along with the title Baron Wandesford, for Christopher Wandesford, 1st Viscount Castlecomer, whose father, Sir Christopher Wandesford, had been created Baronet of Kirklington, North Yorkshire on 5 August 1662 in the Baronetage of England. The 5th Viscount was created Earl Wandesford on 15 August 1758. All three titles and the baronetcy became extinct on his death in 1784.
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