The Iron Hand of Mars is a 1992 historical mystery crime novel by Lindsey Davis and the fourth book of the Marcus Didius Falco Mysteries series. Set in Rome and Germania during AD 71, the novel stars Marcus Didius Falco, informer and imperial agent. The iron in the title refers to the standard, shaped like a giant hand made of iron, which Falco is required to deliver to the imperial legions in Germany.