Thomas Belasyse, 1st Viscount Fauconberg (1577 – 18 April 1653),[1] styled Baron Fauconberg between 1627 and 1643 and Sir Thomas Belasyse, 2nd Baronet between 1624 and 1627, was an English politician who sat in the House of Commons at various times between 1597 and 1624 and was raised to the peerage in 1627. He was an ardent supporter of the Royalist cause in the English Civil War.
Before the Civil War, Belasyse and his family had a long running confrontation with Sir Thomas Wentworth, a close advisor to King Charles I, primarily over local government issues in Yorkshire. This confrontation did not shake Belasyse's support for the monarchy and before and during the Civil War, he and his son Henry, were ardent supporters of the Royalist cause. Charles honoured Belasye in appreciation, but towards the end of the First Civil War, Belasye was forced to flee abroad. While he was in exile his estates were sequestered by Parliament because he was a known "delinquent", and on his return to England and as he refused to swear to the oath of abjuration he was convicted of recusancy.