Spencer Treat Clark (born September 24, 1987) is an American actor. He rose to prominence for his roles in the films Gladiator (2000) and Unbreakable (2000). He has since appeared in the films Mystic River (2003), The Last House on the Left (2009), Much Ado About Nothing (2012) and Glass (2019).

Clark is also known for his roles in the television series Agents of S.H.I.E.L.D. (2015–2018), where he portrayed Werner von Strucker throughout the third and fifth seasons, and Animal Kingdom (2016–2019).