Ripley's Believe It or Not! is a franchise, founded by Robert Ripley, which deals in bizarre events and items so strange and unusual that readers might question the claims. The Believe It or Not panel proved popular and was later adapted into a wide variety of formats, including radio, television, comic books, a chain of museums and a book series.

The Ripley collection includes 20,000 photographs, 30,000 artifacts and more than 100,000 cartoon panels. With 80-plus attractions, the Orlando-based Ripley Entertainment, Inc., a division of the Jim Pattison Group, is a global company with an annual attendance of more than 12 million guests. Ripley Entertainment's publishing and broadcast divisions oversee numerous projects, including the syndicated TV series, the newspaper cartoon panel, books, posters and games.

Ripley first called his cartoon feature, originally involving sports feats, Champs and Chumps, and it premiered on December 19, 1918, in the New York Globe. Ripley began adding items unrelated to sports, and in October 1919, he changed the title to Believe It or Not. When the Globe folded in 1923, Ripley moved to the New York Evening Post. That same year, Ripley hired Norbert Pearlroth as his researcher, and Pearlroth spent the next 52 years of his life in the New York Public Library, working ten hours a day and six days a week in order to find unusual facts for Ripley. Other writers and researchers included Lester Byck.