Thomas Jok Deng (born 20 March 1997) is a professional soccer player who plays as a central defender for J1 League club Yokohama F. Marinos.

[11] Deng made his senior football debut as a 16 year old in 2013 at Western Eagles under then-manager Srecko Barešić-Nikić in the Victorian State League Division 3.

[12][13] The following season, the youngster moved to nearby Green Gully, where manager Bob Stojcevski recruited Deng to play for the club's u20 side.

He made his A-League debut on 9 October 2015 against Adelaide United, as a substitute replacing Fahid Ben Khalfallah after a red card was shown to Leigh Broxham.

[16] On 28 January 2020, Deng left Melbourne Victory to join Japanese club Urawa Red Diamonds following his wonderful performance at the 2020 AFC U-23 Championship.

Deng was part of the main squad of the Olyroos at the 2016 AFC U-23 Championship and put on an extremely impressive display throughout the tournament, garnering high praise from respected Australian pundits: Geoff Fullgrabe, Alan Vucenik, and Craig Foster.