Thomas Yonge or Young (c. 1405–1476) was an English judge.
He was the elder son of Thomas Yonge (d. 1426), who was Mayor of Bristol in 1411, and Member of Parliament for Bristol in 1413–14. His younger brother, Sir John Yonge, settled in London, representing the city in parliament and becoming Sheriff in 1455 and Lord Mayor in 1466. Being, like his brother, a strong Yorkist, he was knighted by Edward IV after his restoration to the throne on 20 May 1471. Thomas Yonge received a legal education at the Middle Temple, and from 1439 onwards his name frequently occurs in the year-books. Probably also he was the Thomas Yonge who was counsel for the city of Exeter in 1447
On 26 September 1435 he was returned to Parliament for Bristol, being described as a "mercator" (merchant). He was re-elected for the same constituency on 17 December 1436, 8 January 1441–2, 31 January 1446–7, 27 January 1448–9, 28 October 1449, and 5 October 1450. Bristol was, like most of the trading centres, Yorkist in sympathies, and in June 1451 Yonge distinguished himself by presenting to Parliament a petition from his constituents to the effect that the Duke of York should be recognised heir to the throne. This was part of the attack upon the Duke of Somerset, whose position was, however, unshaken; parliament was dissolved, and Yonge was committed to the Tower. He was released in April 1452, on the general pardon issued after the temporary reconciliation of the two parties. On 7 July 1455 Yonge was once more elected for Bristol, and in January 1456 claimed redress for his arrest and imprisonment, reminding the commons in his petition that all members "ought to have their freedom to speak and say in the house of their assembly as to them is thought convenient or reasonable without any manner of challenge, charge, or punition therefore to be laid to them in any wise". The commons sent up the bill to the House of Lords, and the king ordered that the Lords of the Council should provide a remedy; but no further proceedings in the matter are recorded.