James P. Vanderbilt (1976-) is an American screenwriter. A member of the notable Vanderbilt family of New York, he is the son of Alfred Gwynne Vanderbilt III (born 1949).

His most recent film Zodiac was nominated for Best Adapted Screenplay by the Chicago Film Critics Association, the Satellite Awards, and the Writers Guild of America.

Vanderbilt graduated from the University of Southern California School of Cinematic Arts in 1998. He had previously graduated from St. Paul's School in Concord, NH in 1994.