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Justin Fonda was born 9 July 1966 in Los Angeles, California. He is the son of Peter Fonda and Susan Brewer, brother of Bridget Fonda, grandson of Henry Fonda, cousin of Troy Garity and Vanessa Vadim, nephew of Jane Fonda, brother-in-law of Danny Elfman, and step-grandson of Noah Dietrich, who was Howard Hughes's confidant for over thirty years.

Fonda has done some acting and has worked as a cameraman on films such as Vertical Limit and The Last Ride. He graduated from Montana State University.