Mamercus is an ancient Roman name; see Mamercus (praenomen). In late antiquity it is found also as Mamertus. People named Mamercus or Mamertus include:
- Mamercus, legendary ancestor of the Roman gens with the nomen Aemilius; see Aemilia (gens)
- Mamercus Aemilius Mamercinus (5th century BC)
- Mamercus Aemilius Lepidus Livianus (d. ca. 62 BC)
- Mamercus Aemilius Scaurus (fl. early 1st century)
- Claudianus Mamertus (d. ca. 473), Gallo-Roman theologian and brother of Saint Mamertus
- Saint Mamertus (d. ca. 475)
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