Maximilian Carlo Martini (born December 11, 1969) is an American actor, writer, and director known for his roles as Corporal Fred Henderson in Saving Private Ryan, Wiley in Level 9, First Sergeant Sid Wojo in The Great Raid, and as Master Sergeant Mack Gerhardt in the military drama television series The Unit. He also starred in the film 13 Hours: The Secret Soldiers of Benghazi as Mark Geist.

Early life and education
Martini's father, Raffaele Martini Pandozy, a sculptor and reformist artist, was born in Rome. Martini's mother, Patricia (née Dunne) Martini Margolin, was a private investigator and parole officer. He has two siblings: actor/producer Christopher Martini and costume designer Michelle Martini. His stepfather, Stuart Margolin, was a director and actor. Martini attended St. Michaels University School in Victoria, Canada.

Martini moved to New York City and studied acting, first at the Neighborhood Playhouse, and then at Michael Howard Studios. He subsequently attended the School of Visual Arts in Manhattan, and received a B.F.A. in painting and sculpture.