Amelia Reynolds Long (1904 – 1978) was an American detective fiction writer, novelist, and a pioneer woman writer for the early science fiction magazines of the 1930s. A resident of Harrisburg, Pennsylvania, she was the author of a number of science fiction stories, and her Weird Tales story, “The Thought-Monster”, was made into the 1958 British film Fiend Without a Face. She wrote under the pseudonyms Peter Reynolds & A. R. Long.