| Part of speech | common noun |
|---|---|
| Plural | protons |
| Albanian | proton |
|---|---|
| Dutch | proton |
| English | proton |
| Esperanto | protono |
| French | proton |
| German | Proton |
| Greek | πρωτόνιο |
| Luxemburgish | Proton |
| Portuguese | próton |
| Romanian | proton |
| Spanish | protón |
| Swahili | protoni |
| Swedish | proton |
| Thai | โปรตอน |
| Turkish | proton |
| Welsh | proton |
| West Frisian | proton |