Harry Hart "Pat" Frank was an American newspaperman, writer, and government consultant. Perhaps the “first of the post-Hiroshima doomsday authors,” his best known work is his post-apocalyptic novel Alas, Babylon (1959), which depicted the outbreak of a nuclear war and the struggles of its survivors in a small, central Florida town.

Alas, Babylon is a 1959 novel by American writer Pat Frank. It is an early example of post-nuclear apocalyptic fiction and has an entry in David Pringle's book Science Fiction: The 100 Best Novels. The novel deals with the effects of a nuclear war on the fictional small town of Fort Repose, Florida, which is based upon the actual city of Mount Dora, Florida, approximately 35 miles northwest of Orlando, Florida. The novel's title is derived from the Book of Revelation: "Alas, alas, that great city Babylon, that mighty city! for in one hour is thy judgment come." The cover art for the Bantam paperback edition was made by Robert Hunt.