Arculus may refer to:
The Roman tutelary god of chests and strongboxes (arcae); see Indigitamenta A crossvein near the base of the wing in certain insects; see Glossary of entomology terms Arculus (bivalve), a genus of the Neoleptonidae family of marine bivalve clams
People with the surname Sir David Arculus (born 1946), British media figure, businessman and advisor to Government Richard Arculus, Australian petrologist and volcanologist Sir Ronald Arculus (1923–2016), British ambassador
See also Aculus, a genus of mites Argulus, a genus of fish lice