Thomas Juel-Nielsen (born 18 June 1990) is a Danish footballer who plays as a centre back.
In August 2013, Juel-Nielsen signed for Sandefjord Fotball until the end of the 2013 season. In 2016, he moved to Falkenbergs FF.
In June 2017, after a brief stint at AGF, Juel-Nielsen signed for Maccabi Netanya in the Israeli Premier League. The following month, however, he left the club.
On 14 February 2018, Juel-Nielsen signed with the Orange County SC of the United Soccer League. On 1 March 2019, Juel-Nielsen moved back to Denmark, signing for SønderjyskE. He left at the end of the season.
On 24 October 2019, Juel-Nielsen signed a one-year contract with a one-year extension option with Liga I club Gaz Metan MediaÃÂ.
Juel-Nielsen is a Danish youth international, having represented the Denmark U17 team 7 times, scoring twice, between 2006 and 2007.