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
See also Regis (disambiguation) (Latin "of the king") Regius (disambiguation) (Latin "royal" masculine adjective) Regia (disambiguation) (Latin "royal" feminine adjective) Regnum (disambiguation) (Latin for "kingdom", see e.g. Kingdom (biology))