Demetri Goritsas (born August 24, 1971, in Eugene, Oregon) is an American actor of Greek and Norwegian heritage who grew up in Prince George, British Columbia, Canada, and has lived most of his adult life in London, England. He trained at the Central School of Speech and Drama in London and has been active since 1994, appearing in over eighty films and television episodes.

His most recognized film roles include Private Parker in Steven Spielberg's Saving Private Ryan (1998), Com Tech in The Bourne Identity (2002), Levene in X-Men: First Class (2011), Stuart Hutchinson in Everest (2015), Cabinet Secretary Bridges in Darkest Hour (2017), CIA Supervisor in Snowden (2016), and Dr. Perkins in Radioactive (2019). He also appeared in Spy Game (2001), National Treasure: Book of Secrets (2007), Rush (2013), Papillon (2017), Borg vs. McEnroe (2017), and Rocketman (2019). On television, Goritsas is best known as Ethan in the Sky One series Baddiel's Syndrome (2001), Max Cain in Modus (2015–2017), Hansen in the Black Mirror episode "Nosedive" (2016), and Bernie Peterson in The Alienist: Angel of Darkness (2020). He also appeared in Episodes (2011–2012), Torchwood (2006), and Spooks (2007). In theatre, he has premiered or originated roles at the UK's National Theatre, the Royal Court, and the Almeida Theatre, and he has done extensive voice-over work for video games including Driver: San Francisco (2011) and Killzone 2 (2009).