No — James Haven is not confirmed to be left-handed, and no reliable public source currently confirms his handedness.
James Haven is an American actor and producer. He is perhaps most widely recognized as the brother of Academy Award-winning actress Angelina Jolie and the son of actors Jon Voight and Marcheline Bertrand.
Haven attended the University of Southern California School of Cinematic Arts. He has appeared in several films, often alongside his sister, including 'Gia' (1998) and 'Original Sin' (2001).
Beyond acting, Haven has also worked as a producer, notably on the 2005 documentary 'Trudell,' which chronicled the life of Native American activist and poet John Trudell.
In recent years, Haven has maintained a lower profile, focusing on various philanthropic and personal endeavors. His career has seen him navigate both mainstream film and independent projects.
