Film
* Harry Potter and the Order of the Phoenix (2007): Played Zacharias Smith
* The Curious Case of Benjamin Button (2008): Played Hotel Manager
* The King's Speech (2010): Played the King's Private Secretary
* The Woman in Black (2012): Played Dr. Foy
* Paddington 2 (2017): Played Mr. Gruber
* The Electrical Life of Louis Wain (2021): Played Dr. Barnes
* The Batman (2022): Played Falcone's Doctor
Television
* Doctor Who (2005-2010): Played Mr. Finch in "The Idiot's Lantern" and "The Family of Blood", and appeared in several other episodes
* Sherlock (2010-2017): Played the role of Mycroft Holmes's bodyguard in "The Great Game"
* The Crown (2016-2020): Played the role of Jack, a valet to Prince Philip
* The Last Kingdom (2015-2022): Played Father Benedict
* His Dark Materials (2019-2020): Played the role of Father Gomez
* The Witcher (2019-present): Played the role of Dr. Ermite
* The Pale Horse (2020): Played the role of Inspector Lejeune
* Sandman (2022): Played the role of The Dream Lord
This is not an exhaustive list, but it highlights some of his most popular and well-known roles. He has also appeared in numerous other television series, including Midsomer Murders, Lewis, Call the Midwife, and Poirot.
Stephen Critchlow is a respected character actor with a wide range of experience and a recognizable face.