Pablo Tell Schreiber (born April 26, 1978) is a Canadian-American actor. He is best known for his stage work and for portraying Nick Sobotka on The Wire (2003), William Lewis on Law & Order: Special Victims Unit (2013–2014), Mad Sweeney on the Starz series American Gods (2017–2020), and as George "Pornstache" Mendez on Orange Is the New Black (2013–2017), for which he received a Primetime Emmy nomination for Outstanding Guest Actor in a Drama Series. He stars as Master Chief in the Paramount+ live-action series Halo (2022–present) which is based on the franchise of the same name.

His film roles include minor roles in Bubble Boy (2001), The Manchurian Candidate (2004), Lords of Dogtown (2005), Vicky Cristina Barcelona (2008), Nights in Rodanthe (2008), Allegiance (2012), and Preservation (2014). He co-starred in the 2016 war film 13 Hours: The Secret Soldiers of Benghazi directed by Michael Bay. In 2018, he starred in the action heist film Den of Thieves opposite Gerard Butler and in Skyscraper with Dwayne Johnson. In 2020, he starred in the drama film Lorelei with Jena Malone.

He is also known for his dramatic stage work including his performance in Awake and Sing! (2006) on Broadway which earned him a nomination for a Tony Award. In 2008, he starred in reasons to be pretty where he won the 2009 Drama Desk Award for Outstanding Featured Actor in a Play. He narrated the audiobook version of Brett Easton Ellis’ American Psycho.