| IETF language tags | art-420 |
| br | |
| العربية | arb-000 | بريتانية |
| ISO 639-PanLex | art-274 | bre-000 |
| brezhoneg | bre-000 | brezhoneg |
| 普通话 | cmn-000 | 布列塔尼语 |
| Cymraeg | cym-000 | Llydaweg |
| English | eng-000 | Breton |
| euskara | eus-000 | bretainiera |
| suomi | fin-000 | bretoni |
| Gàidhlig | gla-000 | Breatannais |
| galego | glg-000 | bretoa |
| yn Ghaelg | glv-000 | Britaanish |
| italiano | ita-000 | bretone |
| Nederlands | nld-000 | Bretons |
| bokmål | nob-000 | bretonsk |
| lingua rumantscha | roh-000 | bretona |
| русский | rus-000 | бретонский |
| español | spa-000 | bretón |