James MacArthur has been married three times. His first marriage was to Joyce Bulifant and lasted from 1958 to 1967. MacArthur's second marriage was to Melody Paterson and lasted from 1970-1975. His third marriages was to H.B. Duntz in 1984 and continues to the present. MacArthur has four children, Charles (named after James' father, Charles MacArthur) and Mary (named after James' sister, that died as a young woman) from his marriage to Joyce Bulifant, Jamie, a son from his marriage to D.B. Duntz, and Juliette, a daughter from a previous relationship.