Sir Thomas Vaughan (c. 1410 – June 1483) was a Welsh medieval soldier and diplomat, an adherent of Jasper Tudor and King Henry VI. Despite this, he was a Yorkist by inclination, as were so many Welshmen of the time, and became ambassador to the courts of the Duchy of Burgundy and France on behalf of the Yorkist King Edward IV. He was knighted in 1475, on the day King Edward's eldest son was invested as Prince of Wales, having acted for some years as Chamberlain to the young prince.
Following the death of Edward IV in 1483, Vaughan was accompanying the young King Edward V when, along with others in the party, he was arrested and executed by the Duke of Gloucester, the future King Richard III. The execution is believed to have taken place some time between 13 and 25 June at Pontefract Castle in West Yorkshire.
He was married to Eleanor FitzAlan, the widow of Sir Thomas Browne, who had likewise been executed in 1460.
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