Arianus may refer to:
- Arianus (Ancient Greek: Ἀριανός) was an ancient Greek of the 3rd century BCE; he was a friend of Bolis, and was employed by him to betray Achaeus to Antiochus III the Great in 214 BCE.
 - From Ariana, a term used by some Greek and Roman authors for a wide area of Central Asia
 - From Arius, an Achaemenid region centered on the city of Herat in present-day western Afghanistan
 - Saint Arianus, 3rd century governor of Ansena, killer of martyrs such as Saint Colluthus, later a Coptic saint himself
 - Arianus, a fictional world in the Death Gate Cycle by Margaret Weis and Tracy Hickman
 - Apodemus arianus, a mouse of family Muridae
 - Eriophyes arianus, a species of acari in genus Eriophyes
 
See also
- Arianus's rat, a rat of family Muridae
 - Arrianus (disambiguation)
 - Ariano (disambiguation)
 - Arius
 
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