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. 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 married Agnes Elizabeth Southwell, daughter of John Southwell, 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 married John Butler, 17th Earl of Ormonde.