Otis Adelbert Kline (1891–1946) was an American author of pulp fiction, best known for his sword and planet stories. He wrote for many of the popular pulp magazines of the early 20th century, including Argosy, All-Story, and Weird Tales. Kline was born in Chicago, Illinois, and attended the University of Chicago. He began writing in the early 1910s, and his first published story appeared in All-Story Magazine in 1914. He wrote in a variety of genres, including science fiction, fantasy, westerns, and detective stories. Kline's most famous works are his sword and planet stories, which were heavily influenced by the works of Edgar Rice Burroughs. He wrote several novels in this genre, including The Swordsman of Mars (1930), The Outlaws of Mars (1933), and The Planet of Peril (1935). Kline also wrote several non-fiction books, including The Complete Book of Swordsmanship (1935) and The Complete Book of Fencing (1937). He also wrote a number of short stories, many of which were collected in The Best of Otis Adelbert Kline (1947). Kline died in 1946 in Los Angeles, California.
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