| IETF language tags | art-420 |
| cu | |
| ISO 639-PanLex | art-274 | chu-000 |
| ѩзыкъ словѣньскъ | chu-000 | ѩзыкъ словѣньскъ |
| Deutsch | deu-000 | Altkirchenslawisch |
| English | eng-000 | Church Slavonic |
| suomi | fin-000 | muinaiskirkkoslaavi |
| italiano | ita-000 | slava ecclesiastica antica |
| bokmål | nob-000 | gammelkirkeslavisk |
| русский | rus-000 | Церковнославянский |