Black Mask was a pulp magazine first published in April 1920 by the journalist H. L. Mencken and the drama critic George Jean Nathan. It is most well-known today for launching the hardboiled crime subgenre of mystery fiction, publishing now-classic works by Dashiell Hammett, Raymond Chandler, Erle Stanley Gardner, Cornell Woolrich, Paul Cain, Carroll John Daly, and others.

Pulp magazines were inexpensive fiction magazines that were published from 1896 until around 1955. The term "pulp" derives from the cheap wood pulp paper on which the magazines were printed. In contrast, magazines printed on higher-quality paper were called "glossies" or "slicks". The typical pulp magazine had 128 pages; it was 7 inches (18 cm) wide by 10 inches (25 cm) high, and 0.5 inches (1.3 cm) thick, with ragged, untrimmed edges. Pulps were the successors to the penny dreadfuls, dime novels, and short-fiction magazines of the 19th century.