John C. Allen, American roller coaster designer (born 1907)

John C. Allen was a roller coaster designer who was responsible for the revival of wooden roller coasters which began in the 1960s. He attended Drexel University. He started working for the Philadelphia Toboggan Company in 1934 as a coaster operator and rose to become president of the company by 1954. He designed more than 25 coasters and made significant contributions to roller coaster technology. He once said, "You don't need a degree in engineering to design roller coasters, you need a degree in psychology."

A roller coaster is a type of amusement ride employing a form of elevated railroad track that carries passengers on a train through tight turns, steep slopes, and other elements. Roller coasters are usually designed to produce a thrilling experience, though some roller coasters aim to provide a more gentle experience. Trains consist of open cars connected in a single line, and tracks are typically built and designed as a complete circuit in which trains depart from and return to the same loading station. The rides are often found in amusement parks around the world. There are an estimated 6,600 extant roller coasters as of August 2025.