The Spider is an American pulp-magazine hero of the 1930s and 1940s. The character was created by publisher Harry Steeger and written by a variety of authors for 118 monthly issues of The Spider from 1933 to 1943. The Spider sold well during the 1930s, and copies are valued by modern pulp magazine collectors. Pulp magazine historian Ed Hulse has stated "Today, hero-pulp fans value The Spider more than any single-character magazine except for The Shadow and Doc Savage."

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.