Postbellum

may refer to:


 * Any post-war period or era
 * Post-war period following the American Civil War (1861–1865); nearly synonymous to Reconstruction era (1863–1877)
 * Post-war period in Peru following its defeat at the War of the Pacific (1879–1883). Usually known by its Spanish name posguerra.
 * Jus post bellum in Just War Theory
 * Post Bellum, a Czech non-profit