Born in New York City, New York, Hilton is the oldest of four children of Richard and Kathy Hilton. Paris has a younger sister, Nicky, and younger brothers Barron Nicholas Hilton and Conrad Hughes Hilton.
On the maternal side of her family, Paris is a niece of two child stars of the 1970s, Kim Richards and Kyle Richards. Paris was related by marriage to Nicole Richie's godmother, Nancy Davis, when Nancy's brother, Greg, was married to Kim Richards.
Paris' paternal grandparents are hotel chairman Barron Hilton, and his wife, the former Marilyn Hawley; Barron Hilton's parents were Hilton Hotels founder Conrad Hilton and his first wife, Mary Barron.