Film
* The Visitor (2007): Sleiman starred as Tarek, a Syrian musician who befriends a widower (Richard Jenkins). This role garnered him critical acclaim and established him as a promising talent.
* American Sniper (2014): He played Mustafa, a sniper who is an enemy of Chris Kyle (Bradley Cooper).
* The Cloverfield Paradox (2018): Sleiman had a supporting role as a scientist on a space station.
* The Farewell (2019): He played the role of Hao, a character who learns about his grandmother's terminal illness.
Television
* The Wire (2004-2008): He appeared in several episodes as "Brother Mouzone", a hitman with a charismatic and intellectual personality.
* Nurse Jackie (2009-2015): He played Dr. Mohamoud "Mo" De La Cruz, a recurring character and love interest for Jackie Peyton (Edie Falco).
* The Americans (2013-2018): He played the role of "Amir", an intelligence officer who works for the Soviet Union.
* The Handmaid's Tale (2017-present): He plays a recurring character, a Gilead Commander, who is the husband of a handmaid.
* The Looming Tower (2018): He had a supporting role as a character named "Alim", a Palestinian activist.
* The Blacklist (2013-present): Sleiman made guest appearances as "Aram Mojtabai", a character with a connection to the titular blacklist.
Other Projects
* Sleiman has also starred in plays on Broadway, including the acclaimed production of "The King and I" (2015).
* He has voiced characters in video games like "Grand Theft Auto V" and "Max Payne 3".
This list is not exhaustive, but it showcases the breadth of Sleiman's acting career, encompassing various genres and roles. He has consistently delivered compelling performances, establishing himself as a talented and versatile actor in the entertainment industry.