William Barron Hilton I (born October 23, 1927) is an American socialite, heir, and hotelier, co-chairman of the Hilton Hotels chain, and the original owner of the San Diego Chargers. He is the paternal grandfather of Paris, Nicky, Barron, and Conrad Hilton.

Barron Hilton was born in Dallas, Texas, the second son of Conrad Nicholson Hilton and Mary Adelaide Barron. His father founded Hilton Hotels. His brothers are Eric Hilton and the late Conrad Nicholson Hilton, Jr., called "Nicky," who was actress Elizabeth Taylor's first husband (1950). He also has a younger half-sister (b. 1947), Francesca Hilton, whose mother is Zsa Zsa Gabor.

Barron was active for several years in organizing and managing businesses in Los Angeles, and was also a member of the board of directors of the Statler Hotels Delaware Corporation and of the Conrad N. Hilton Foundation.