James Allan Schamus (born September 7, 1959) is an American screenwriter, producer, business executive, film historian, professor, and director. He is a frequent collaborator of Ang Lee, the co-founder of the production company Good Machine, and the co-founder and former CEO of motion picture production, financing, and worldwide distribution company Focus Features, a subsidiary of NBCUniversal. He is currently president of the New York–based production company Symbolic Exchange and is Professor of Professional Practice at Columbia University, where he has taught film history and theory since 1989.

Schamus was born in Detroit, Michigan, to a Jewish family.He is the son of Clarita (Gershowitz) Karlin and Julian John Schamus and was raised in Los Angeles. He is married to writer Nancy Kricorian, with whom he has two children.