Regium

Regium may refer to:


 * Reggio Calabria, town in Calabria, Italy; Latin name Regium
 * Reggio Emilia, town in Emilia, Italy; Latin name Regium
 * Regium Donum, an annual grant formerly voted by Parliament to augment the stipends of the Presbyterian clergy in Ireland
 * Collegium Regium (disambiguation), Latin for King's College or Royal College