Arcus
- Agfa
- Arctic policy of the United States
- Arcus (planetary geology)
- Arcus (satellite)
- Arcus AS
- Arcus Argentariorum
- Arcus Foundation
- Arcus Odyssey
- Arcus anterior atlantis
- Arcus cloud
- 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 senilis
- 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
- Arcus-Air
- Inverse trigonometric functions
- List of X68000 games
- List of modern armament manufacturers
- Schempp-Hirth Arcus