- His National Theatre credits include: Shaw's "Saint Joan", and Albert in "War Horse", based on the novel by Michael Morpurgo (both 2007).
- Played Garth in "Piranha Heights", a new play by Philip Ridley - Soho Theatre, London (2008).
- Played Daniel in "Cradle Me", a new play by Simon Vinnicombe - Finborough Theatre, London (2008).
- Played Allan in "Dr Calgari" based on the film The Cabinet of Dr. Caligari (1920) - BBC Radio 3 (2008).
- (March 2009) Played Karl in "Over There" play by Mark Ravenhill (Royal Court Theater, London, England, UK).
- (2012) He also appears in music video for Crystal Fighters' song "Champion Sound".
- (2012) Treadaway appears in the music video for The Script's song "For the First Time".
- (August 2012 - October 2012) Played Christopher in "The Curious Incident of the Dog in the Night-Time" play by Simon Stephens based on the novel by Mark Haddon (National Theatre, London, UK).
- (2013) Appears in the music video for The Boxettes - "Puppet on a String".
- (2017) Plays Nick in "Who's Afraid Of Virginia Woolf?" at the Harold Pinter Theatre. The cast includes Imelda Staunton (as Martha), Conleth Hill (as George) and Imogen Poots (as Honey).
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