Himerius (variants include Himerios, Imerius, Imerio, Imier, Immer) can refer to:
Himerius (c. 315 – c. 386), Bithynian philosopher Himerius of Tarragona (fl. 385), archbishop of Tarragona (Spain) Himerios (admiral) (fl. 900–920), Byzantine admiral and statesman A fictional character in the novel series Monarchies of God by Paul Kearney Christian saints: Himerius of Immertal (c. 570 – c. 620) Himerius of Cremona (d. c. 560) Himerius of Bosto (fl. c. 11th century) Saint Camelianus (also called Himerius), bishop of Troyes (479–536 or 511–525)