- (Greek mythology) The ship in which Jason and the Argonauts sailed on their quest for the Golden Fleece.
- (astronomy) Argo Navis, a large constellation in the southern hemisphere, now divided into Carina, Puppis, and Vela.
- the Argo (mythical ship)
Fourth declension, with irregular nominative in -ō. Only the genitive and accusative are attested. The remaining forms have been reconstructed based on the Greek inflection.
- English: Argo
- Argo in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
- Argō in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français [Illustrated Latin-French Dictionary], Hachette, page 159/3
- Argo in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
- (Greek mythology) Argus (giant with a hundred eyes)
- (Greek mythology) Argo (mythical ship of the Argonauts)