Christopher Eugene "Chris" O'Donnell (born June 26, 1970) is an American actor who is best known for his role as Robin in two Batman films, Batman Forever and Batman & Robin (along with George Clooney), G. Callen on the CBS military drama/police procedural series NCIS: Los Angeles since 2009, and Shane in Cats & Dogs: The Revenge of Kitty Galore.

He played D'Artagnan in the 1993 Disney film The Three Musketeers, and Matt Leland in the Touchstone Pictures film Mad Love.