A pop-up book is any book with three-dimensional pages, often with elements that pop up as a page is turned. The terminology serves as an umbrella term for movable book, pop-ups, tunnel books, transformations, volvelles, flaps, pull-tabs, pop-outs, pull-downs, and other features each performing in a different manner. Three-dimensional greeting cards use the same principles. Design and creation of such books in arts is sometimes called "paper engineering". This usage should not be confused with traditional paper engineering, the engineering of systems to mass-produce paper products.

Robert Sayer (1725–1794) was a leading publisher and seller of prints, maps and maritime charts in Georgian Britain. He was based near the Golden Buck on 53 Fleet Street in London.