Ronald Jeremy Hyatt (born March 12, 1953), usually called Ron Jeremy, is an American pornographic actor. Nicknamed "The Hedgehog", he was ranked by AVN at number one in their "100 Top Porn Stars of All Time" list. Jeremy has also appeared in non-pornographic films, with studios such as Troma Entertainment, Boondock Saints and Studio 54.

He is well known for his large circumcised penis – claimed by him to be 9.75 inches – and he has gained some notoriety for being capable of autofellatio (which he first demonstrated on-screen in Inside Seka), though he stated in a 2003 interview that due to his weight gain, all he can do nowadays is kiss the tip of his penis.

Ronald Hyatt was born in Queens, New York to an upper middle-class Jewish family; his father, Arnold, was a physicist and his mother a book editor who served in the O.S.S. during World War II as she spoke fluent German and French. He had an uncle who was a gangster with ties to Bugsy Siegel.