Typewriter in the Sky is a science fantasy novel by American writer L. Ron Hubbard. The protagonist Mike de Wolf finds himself inside the story of his friend Horace Hackett's book. He must survive conflict on the high seas in the Caribbean during the 17th century, before eventually returning to his native New York City. Each time a significant event occurs to the protagonist in the story he hears the sounds of a typewriter in the sky. At the story's conclusion, de Wolf wonders if he is still a character in someone else's story. The work was first published in a two-part serial format in 1940 in Unknown Fantasy Fiction. It was twice published as a combined book with Hubbard's work Fear. In 1995 Bridge Publications re-released the work along with an audio edition.

Lafayette Ronald Hubbard was an American author and the founder of Scientology. A prolific writer of pulp science fiction and fantasy novels in his early career, in 1950 he authored Dianetics: The Modern Science of Mental Health and established organizations to promote and practice Dianetics techniques. Hubbard created Scientology in 1952 after losing the intellectual rights to his literature on Dianetics in bankruptcy. He would lead the Church of Scientology, variously described as a cult, a new religious movement, or a business, until his death in 1986.