Costas Mandylor is an Australian actor. He is best known for his roles as Kenny Lacos in Picket Fences and Mark Hoffman in the Saw films.

Detective Lieutenant Mark Hoffman is a fictional character and the secondary antagonist of the Saw franchise. He is portrayed by Australian actor Costas Mandylor. While the character was first shown as a police officer in Saw III, later films in the series have expanded his role and revealed him to be an apprentice, and subsequently the successor of the Jigsaw Killer, as the new Jigsaw. He serves as the secondary antagonist in Saw IV, and the main antagonist in Saw V, Saw VI and Saw 3D. He appears in the mid-credits scene of Saw X, setting up a new trap alongside Jigsaw.