Thomas Mann is an American actor. He is known for his roles in the films Project X (2012), As Cool as I Am (2013), Hansel & Gretel: Witch Hunters (2013), Me and Earl and the Dying Girl (2015), Kong: Skull Island (2017), and Halloween Kills (2021).

Project X is a 2012 American found footage teen comedy film directed by Nima Nourizadeh, written by Michael Bacall and Matt Drake and produced by Todd Phillips. The film follows three friends—Thomas, Costa and J.B. —who attempt to gain popularity by throwing a party, a plan which quickly escalates out of their control.