| Greater argonaut | 
|  | 
| Argonauta argo inside its shell | 
|  | 
| Illustration from I Cefalopodi viventi nel Golfo di Napoli (1896) | 
|  | 
|  | 
| Scientific classification | 
| Domain: | Eukaryota | 
 
| Kingdom: | Animalia | 
 
| Phylum: | Mollusca | 
 
| Class: | Cephalopoda | 
 
| Order: | Octopoda | 
 
| Family: | Argonautidae | 
 
| Genus: | Argonauta | 
| Species: | A. argo | 
| Binomial name | 
| Argonauta argo 
 | 
|
| Synonyms | 
| 
Argonauta papyraceaRöding, 1798
Argonauta grandiformisPerry, 1811
?Argonauta striataPerry, 1811
Ocythoe antiquorumLeach, 1817
Trichocephalus acetabularisChiaie, 1827 in 1823-1831
?Todarus argo nom. nud.Rafinesque, 1840
Argonauta minorRisso, 1854
Argonauta naviformisConrad, 1854
Argonauta papyriaConrad, 1854
?Argonauta argo f. agglutinansVon Martens, 1867
?Argonauta argo f. auritaVon Martens, 1867
?Argonauta argo f. muticaVon Martens, 1867
?Argonauta argo f. obtusangulaVon Martens, 1867
Argonauta bulleriKirk, 1886
?Argonauta argo var. americanaDall, 1889
Argonauta cygnusMonterosato, 1889
Argonauta ferussaciMonterosato, 1914
Argonauta argo mediterraneaMonterosato, 1914
?Argonauta monterosatoiCoen in Monterosato, 1914
?Argonauta monterosatoiCoen, 1914
?Argonauta monterosatoiCoen, 1915
Argonauta sebaeValenciennes in Monterosato, 1914
 | 
Argonauta argo, also known as the greater argonaut, is a species of pelagic octopus belonging to the genus Argonauta.  The Chinese name for this species translates as "white sea-horse's nest".
A. argo was the first argonaut species to be described and is consequently the type species of the genus. The type specimen of A. argo was collected in the Mediterranean Sea and is deposited at the Linnean Society of London.