Arcus may refer to:
Businesses and organizations ARCUS, the Arctic Research Consortium of the United States, formerly supporting Arctic policy in the U.S. Arcus AS, a Norwegian producer of liquor Arcus Co., a Bulgarian firearm manufacturer Arcus Foundation, supporting great apes and LGBT rights Arcus-Air, a German airline
Gliders Schempp-Hirth Arcus a two-seat glider Pegas Arcus, a Czech paraglider design Swing Arcus, German paraglider design
Human anatomy Arcus anterior atlantis Arcus aortae Arcus corneae Arcus costalis Arcus dentalis Arcus dentalis mandibularis Arcus dentalis maxillaris Arcus ductus thoracici Arcus iliopectineus Arcus inguinalis Arcus lumbocostalis lateralis Arcus lumbocostalis medialis Arcus palatini Arcus palatoglossus Arcus palatopharyngeus Arcus palmaris profundus Arcus palmaris superficialis Arcus pedis longitudinalis pars lateralis Arcus pedis longitudinalis pars medialis Arcus pedis transversalis Arcus plantaris Arcus plantaris profundus Arcus posterior atlantis Arcus pubis Arcus tendineus fasciae pelvis Arcus unguium Arcus venosus dorsalis pedis Arcus venosus jugularis Arcus venosus palmaris profundus Arcus venosus palmaris superficialis Arcus venosus plantaris Arcus volaris profundus Arcus volaris superficialis
Video games Arcus II: Silent Symphony Arcus Odyssey Arcus (video game), see List of X68000 games
Other uses Arcus cloud formation Agfa Arcus scanners Arcus (planetary geology) (pl. arcūs), an arc-shaped feature Arcus senilis, age-related change in the iris Arcus (satellite), a proposed X-ray space telescope Inverse trigonometric functions, also called arcus or arc functions Arcus Argentariorum, an arch of San Giorgio al Velabro Church, Rome, Italy Arcus, the main protagonist of the webcomic Acception