John Butler, 6th Earl of Ormond (died 14 December 1476) was considered one of the first gentlemen of the age in which he lived. He was an ambassador to the most important courts of Europe.
He was the second son of James Butler, 4th Earl of Ormond, by his first wife, Joan de Beauchamp (d. 3 or 5 August 1430). He had an elder brother, James Butler, 5th Earl of Ormond, and a younger brother, Thomas Butler, 7th Earl of Ormond, as well as two sisters, Elizabeth Butler, who married John Talbot, 2nd Earl of Shrewsbury, and Anne Butler (d. 4 January 1435), who was contracted to marry Thomas FitzGerald, 7th Earl of Desmond, although the marriage appears not to have taken place.
By his mistress Reynalda O'Brien, daughter of Turlogh "The Brown" O'Brien, King of Thomond, he had three illegitimate sons, including Sir James Ormond.
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