|Alma mater||University of Cambridge|
Coulson was born in Manchester. He attended Arnold House Preparatory School in London, before attending Westminster School on an academic scholarship. He was a member of the UK's National Youth Music Theatre from 1990–1997, and went on to the University of Cambridge, where he received a degree in English from Clare College in 2000. While at university, he played the M.C. (Master of Ceremonies) in Cabaret, Arturo Ui in The Resistible Rise of Arturo Ui and Claire in The Maids, as well as appearing in film and television.
Coulson gained worldwide attention and popularity for his role in 2002's Harry Potter and the Chamber of Secrets, in which he portrayed a 16-year-old Tom Riddle, even though Coulson was 24 years old at the time. However, in 2007, director David Yates indicated on MTV that Coulson would not reprise his role in Half-Blood Prince, since, at 29, he was now too old.
He also wrote the lyrics and book for a rock musical called The Fallen which was performed at Bedford Modern School in 1998.
|2002||The Four Feathers||Drummer Boy||Uncredited|
|Harry Potter and the Chamber of Secrets||Tom Riddle||Nominated - Phoenix Film Critics Society Award for Best Cast|
|The Hours||Ralph Partridge||Helper at Hogarth Press, run by Leonard Woolf|
|2005||Take Me Back||Charlie|
|2007||Last Night||Nick|||
|2012||I Am Nasrine||Tommy|
|2014||Love Is Strange||Ian|
|2015||Peter and John||Peter Roland|
|2019||Bite Me||James Thayer|
|2001||Love in a Cold Climate||Matt Radlett||Miniseries|
|Weirdsister College||Ben Stemson||Main role; 13 episodes|
|2002||The Forsyte Saga||Jolly Forsyte||Episodes: "Episode #1.5", "Episode #1.6"|
|2003||Hornblower: Loyalty||Midshipman John 'Jack' Hammond||Television film|
|Charles II: The Power and The Passion||James, Duke of Monmouth||4 episodes|
|Little Britain||Joe||Episode: "Hard-Boiled Egg Eating"|
|2005||Agatha Christie's Marple||Edmund Swettenham|
|Beethoven||Archduke Rudolph||Miniseries; 2 episodes|
|Brief Encounters||Adam||Episode: "Lost & Found"|
|2009||The Battery's Down: Losing My Mind||Raoul||Episode: "Losing My Mind"|
|2010||Jeffery & Cole Casserole||Episode: "The Becky"|
|Gossip Girl||Ivan||Episode: "Touch of Eva"|
|2011||Wiener & Wiener||Garry||3 episodes|
|The Good Wife||Andre Bergson||Episode: "Death Row Tip"|
|2017||Nashville||Damien George||5 episodes|
|2018||Mozart in the Jungle||Sebastian||8 episodes|
|2019||Until the Wedding||James||TV pilot|
|2007||Doctor Who: The Bride of Peladon||Pelleas|
|2008||Doctor Who: The Haunting of Thomas Brewster||Robert McIntosh|
|2011||The White Devil||Justin Evans|||
|2014||Moth and Spark||Anne Leonard|||
|2014||Twenty Trillion Leagues Under the Sea||Adam Roberts|||
|2015||The Dead House||Dawn Kurtagich||AudioFile Earphones Award|||
|2016||No Man's Land||Simon Tolkien|||
|2017||The Gentleman's Guide to Vice and Virtue||Mackenzi Lee||AudioFile Earphones Award|||
- King Richard II - Pennsylvania Shakespeare Festival, Desales University (2018) King Richard
- Shakespeare in Love - Pennsylvania Shakespeare Festival, Desales University (2018) Lord Wessex
- Travesties - McCarter Theatre, New Jersey (2012) Tristan Tzara
- Ghosts - Gate Theatre, London (2007) Osvald
- Festen - UK Tour (2006) Christian
- Journey's End - Comedy Theatre, London (2004) Raleigh
- Romeo and Juliet - Liverpool Playhouse, Liverpool (2002) Romeo
- Suhas, Maitri. "What Happened To Cute Voldemort?". Bustle.
- Vineyard, Jennifer (25 June 2007). "'Harry Potter' Casting Call Could Help Ron Weasley Find Perfect Shade Of Lavender / Director David Yates also hopes to fill role of Tom Riddle at another open casting call". MTV. Archived from the original on 27 June 2007. Retrieved 11 May 2009.
- "Coulson Photography". Archived from the original on 25 December 2010.
- "Audiobook Review: The White Devil (2011)". AudioFile. Retrieved 4 February 2019.
- "Audiobook Review: Moth and Spark (2014)". AudioFile. Retrieved 4 February 2019.
- "Audiobook Review: Twenty Trillion Leagues Under the Sea (2014)". AudioFile. Retrieved 4 February 2019.
- "Audiobook Review: The Dead House (2015)". AudioFile. Retrieved 4 February 2019.
- "Audiobook Review: No Man's Land (2016)". AudioFile. Retrieved 4 February 2019.
- "Audiobook Review: The Gentleman's Guide to Vice and Virtue (2017)". AudioFile. Retrieved 4 February 2019.
- "Audiobook Review: Into? (2018)". AudioFile. Retrieved 4 February 2019.