Born on April 15, 1933, in Los Angeles, California, Elizabeth Montgomery was the child of actor Robert Montgomery and his wife, Broadway actress Elizabeth Bryan (Allen).

She had an older sister, Martha Bryan Montgomery, who died as an infant (named after her aunt Martha-Bryan Allen) and a brother, Robert Montgomery, Jr. (1936 - 2000). She attended Westlake School For Girls (now Harvard-Westlake School in Holmby Hills).

Elizabeth Montgomery's Family Tree