Ripley's Believe It or Not! is an American franchise founded by Robert Ripley, which deals in bizarre events and items so strange and unusual that readers might question the claims. Originally a newspaper panel, the Believe It or Not feature 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.

LeRoy Robert Ripley was an American cartoonist, entrepreneur, and amateur anthropologist, who is known for creating the Ripley's Believe It or Not! newspaper panel series, television show, and radio show, which feature odd facts from around the world.