Postumus (disambiguation)

Postumus (Marcus Cassianius Latinius Postumus, died 269) was a Roman usurper and founder of the Gallic Empire.

Postumus may also refer to:
 * Agrippa Postumus (12 BC – 14 AD), son of Marcus Vipsanius Agrippa
 * Postumus Junior (died 268), alleged son of the Gallic emperor
 * Postumus (praenomen), Roman praenomen