Dancy currently portrays Senior Assistant District Attorney Nolan Price on NBC's revival of the original Law & Order (2022–present).

[1] After graduation, Dancy moved to London, where a chance conversation in a cafe led to his meeting casting director Ros Hubbard and agent Dallas Smith, who signed him.

[1] In 1999, Dancy appeared in the second series of Cold Feet in the role of Danny, who had a fleeting romance with Rachel, one of the show's main characters.

[10] In August 2018, it was announced he would appear with Stockard Channing in Roundabout Theatre Company's off-Broadway premiere of Apologia, written by Alexi Kay Campbell, in the dual roles of Peter and Simon.

[11] In March 2012, NBC announced that Dancy had been cast as Will Graham in Hannibal, the television adaptation based on the main character of Thomas Harris' 1981 novel Red Dragon.

[13] From 2016 to 2018, he appeared for three seasons as Cal Roberts, a lead character in Hulu's The Path, alongside Aaron Paul and Michelle Monaghan.