| ISO 259-3 | heb-001 |
| neptun | |
| Classical Arabic—ASJP | arb-001 | nibtûn |
| català | cat-000 | Neptú |
| Deutsch | deu-000 | Neptun |
| Ellinika | ell-003 | Posidōnas |
| English | eng-000 | Neptune |
| euskara | eus-000 | Neptuno |
| français | fra-000 | Neptune |
| hyw-001 | Neptun | |
| íslenska | isl-000 | Neptúnus |
| italiano | ita-000 | Nettuno |
| 日本語 | jpn-000 | かいおうせい, kaiousei |
| reo Māori | mri-000 | Tangaroa |
| Nederlands | nld-000 | Neptunus |
| português | por-000 | Neptuno |
| russkij | rus-001 | Neptun |
| español | spa-000 | Neptuno |