Conrad Nicholson Hilton, Jr., known as Nicky, was an American socialite and heir of the Hilton Hotels chain, a business executive and TWA director.

He was born in Dallas, Texas, the eldest son of Conrad Nicholson Hilton and Mary Adelaide Barron. His father founded Hilton Hotels. His brothers are William Barron Hilton and Eric Michael Hilton. He also had a younger half-sister, Francesca Hilton, whose mother is Zsa Zsa Gabor. Paris and Nicky Hilton are his grand nieces, the latter sharing his nickname.

Famously, Conrad slept with Zsa Zsa Gabor, his stepmother, who publically admitted to sleeping with her stepson while married to his father, Conrad Hilton.

Hilton was married twice, once to actress Elizabeth Taylor and later to oil heiress Patricia "Trish" McClintock. He and McClintock had two children, Conrad Nicholson Hilton III (born January 29, 1960) and Michael Otis Hilton (born June 12, 1961).

Nicky Hilton died at age 42 of a heart attack in West Los Angeles, California. He is interred in Holy Cross Cemetery, Culver City.