Blatty married four times and had seven children. With his first wife, Mary Margaret Rigard, whom he married on February 18, 1950, he had three children: Christine Ann, Michael Peter, and Mary Joanne. His first marriage ended in divorce after 13 years. His second wife was Elizabeth Gilman, whom he married in 1965. In July 1975 he married his third wife, tennis professional Linda Tuero, with whom he had two children. Following the dissolution of his first three marriages, Blatty married Julie Alicia Witbrodt, his fourth wife, in 1983, with whom he had two children. The couple remained together until Blatty's death in 2017. After residing for many years in Hollywood and Aspen, Blatty settled in Bethesda, Maryland in 2000.