He portrayed the lead role of Father Faustus Blackwood in Netflix series Chilling Adventures of Sabrina, and Jeff Murdock in the sitcom Coupling.
[3] He began by appearing in such television programmes as Lorna Doone, as John Ridd and Evelyn Waugh's wartime saga Sword of Honour, and in Mike Leigh's film Topsy-Turvy.
[6] In a 2005 interview, Coyle stated this was to avoid typecasting: I'm very proud to have been part of Coupling and very grateful for the chance to play Jeff but I was very keen that that character didn’t stick with me forever.
[10] In 2012, Coyle joined the cast of the USA Network show Covert Affairs as Simon Fischer, an FSB agent and love interest for Piper Perabo's Annie Walker.
[12] In 2014, NBC began airing the series Crossbones, with Coyle as Tom Lowe, who is assigned to kill the pirate Blackbeard (played by John Malkovich).
[13] In 2018, Coyle was cast as Father Faustus Blackwood, a high priest of the Church of Night and Dean of the Academy of the Unseen Arts in the Netflix series Chilling Adventures of Sabrina.
From September to November 2004, Coyle played the title role in Michael Grandage's production of Friedrich Schiller's Don Carlos which then transferred to the West End from January to April 2005.
[citation needed] In 2014 he played MacDuff in the Kenneth Branagh and Rob Ashford directed Macbeth at the Park Avenue Armory, New York City.
[18] From 10 March until 19 November 2022 Coyle starred in the role of Atticus Finch in the West End debut of Aaron Sorkin's adaptation of Harper Lee's American classic, To Kill a Mockingbird.
Coyle played Keats in the game Folklore and has also narrated the following audio books: At The Mountains of Madness and The Shadow Over Innsmouth by H. P. Lovecraft, Resistance by Owen Sheers, and the H.I.V.E.