Sam Spade is a fictional private detective and the protagonist of Dashiell Hammett's 1930 novel, The Maltese Falcon. Spade also appeared in four lesser-known short stories by Hammett.
The Maltese Falcon, first published as a serial in the pulp magazine Black Mask, is the only full-length novel in which Spade appears. The character, however, is widely cited as a crystallizing figure in the development of hard-boiled private detective fiction – Raymond Chandler's Philip Marlowe, for instance, was strongly influenced by Spade.
Spade was a departure from Hammett's nameless and less-than-glamorous detective, The Continental Op. Spade combined several features of previous detectives, most notably his detached demeanor, keen eye for detail, and unflinching determination to achieve his own justice.