Camillus may refer to:
- A young assistant in religious ritual in ancient Rome
- Camillus (feminine Camilla), a cognomen in ancient Rome
- A hereditary cognomen in the gens Furia
- Marcus Furius Camillus
- A given name derived from the cognomen, see Camille (disambiguation)
- Camillus, New York may refer to either of the following jurisdictions in Onondaga County:
- Camillus, New York
- Camillus (village), New York, wholly contained within the town
- Camillus Cutlery Company