Otis Adelbert Kline (July 1, 1891 – October 24, 1946) was an American songwriter,[1] adventure novelist and literary agent during the pulp era.

Kline's jungle adventure stories, reminiscent of Burroughs's Tarzan tales, have also been cited as evidence of the conflict.

The feud theory was originally set forth in a fan press article, "The Kline-Burroughs War," by Donald A. Wollheim (Science Fiction News, November, 1936), and afterward given wider circulation by Sam Moskowitz in his book Explorers of the Infinite (1963).

[citation needed] In the mid-1930s Kline largely abandoned writing to concentrate on his career as a literary agent (most famously for fellow Weird Tales author Robert E. Howard, pioneer sword and sorcery writer and creator of Conan the Barbarian).

It has been suggested that Kline may have completed Howard's "planetary romance" Almuric, which he submitted to Weird Tales for posthumous publication in 1939,[3] although this claim is disputed.