Arctus

Arctus may refer to:
 * Arctus (crustacean) Dana, 1852, a genus of crustaceans in the family Scyllaridae
 * Arctus Haan in Siebold, 1849, a genus of crustaceans in the family Scyllaridae, synonym of Scyllarus
 * Arctus (centaur), one of those arrayed against the Lapiths on the Shield of Heracles in Greek mythology.
 * Arctus, one of the Horae