[6] Kingsley's theatre credits include Troilus and Cressida, and Little Eyolf for the Royal Shakespeare Company.
[6][7] He played Rosencrantz in the National Theatre's 2010–11 production of Hamlet, for which he received a commendation at the 2010 Ian Charleson Awards, and Phaeax in Welcome to Thebes.
[7][11] In 2013, Kingsley played the part of murdered Jewish anarchist Joshua Bloom in the BBC period crime drama Ripper Street, and filmed prominent roles in Agatha Christie's Poirot: Elephants Can Remember, the BBC feature film The Whale as Obed Hendricks, and Universal Pictures' 2014 feature Dracula Untold as Hamza Bey.
From 2016 to 2019, Kingsley starred in ITV's drama Victoria as Italian British cook Charles Elmé Francatelli.
In 2023, Kingsley portrayed George Wilkins in the series Silo on Apple TV+,[13] and the mysterious villain A.M. in Reacher (season 2) on Amazon Prime Video.