Thomas John Wynn, 2nd Baron Newborough (3 April 1802 – 15 November 1832), was a British peer.
Newborough was the eldest son of Thomas Wynn, 1st Baron Newborough, and Maria Stella Petronilla, daughter of Lorenzo Chiappini.
Newborough succeeded his father in the barony in 1807. However, as this was an Irish peerage it did not entitle him to a seat in the House of Lords. He was instead elected to the House of Commons for Carnarvonshire in 1826, a seat he held until 1830.
Lord Newborough died in November 1832, aged 30. He was unmarried and was succeeded by his younger brother, Spencer.