The Spirit is a fictional masked crimefighter created by cartoonist Will Eisner. He first appeared June 2, 1940,[1] as the main feature of a 16-page, tabloid-sized, newsprint comic book insert distributed in the Sunday edition of Register and Tribune Syndicate newspapers; it was ultimately carried by 20 Sunday newspapers, with a combined circulation of five million copies during the 1940s. "The Spirit Section", as the insert was popularly known, continued until October 5, 1952.[1] It generally included two other four-page strips (initially Mr. Mystic and Lady Luck), plus filler material. Eisner, the overall editor, wrote and drew most Spirit entries, with the uncredited assistance of his studio of assistants and collaborators, though with Eisner's singular vision a unifying factor.[2]

The Spirit chronicles the adventures of a masked vigilante who fights crime with the blessing of the city's police commissioner Dolan, an old friend. Despite the Spirit's origin as detective/criminoligist Denny Colt, his real identity was rarely referred to after his first appearance, and for all intents and purposes he was simply "The Spirit". The stories are presented in a wide variety of styles, from straightforward crime drama and noir to lighthearted adventure, from mystery and horror to comedy and love stories, often with hybrid elements that twisted genre and reader expectations.

From the 1960s to 1980s, a handful of new Eisner Spirit stories appeared in Harvey Comics and elsewhere, and Warren Publishing and Kitchen Sink Press variously reprinted the newspaper feature in black-and-white comics magazines and in color comic books. In the 1990s and 2000s, Kitchen Sink Press and DC Comics also published new Spirit stories by other writers and artists.