Linwood Vrooman Carter was an American author of science fiction and fantasy, as well as an editor, poet and critic. He usually wrote as Lin Carter; known pseudonyms include H. P. Lowcraft and Grail Undwin. He is best known for his work in the 1970s as editor of the Ballantine Adult Fantasy series, which introduced readers to many overlooked classics of the fantasy genre.

The Ballantine Adult Fantasy series was an imprint of American publisher Ballantine Books. Launched in 1969, the series reissued a number of works of fantasy literature which were out of print or dispersed in back issues of pulp magazines, in cheap paperback form—including works by authors such as James Branch Cabell, Lord Dunsany, Ernest Bramah, Hope Mirrlees, and William Morris. The series lasted until 1974.