This is a list of languages that SharePoint Online supports and the codes to represent them:
| Name | Language Tag | LCID |
|---|---|---|
| Arabic | ar-SA | 1025 |
| Azerbaijani | az-Latn-AZ | 1068 |
| Basque | eu-ES | 1069 |
| Bosnian (Latin) | bs-Latn-BA | 5146 |
| Bulgarian | bg-BG | 1026 |
| Catalan | ca-ES | 1027 |
| Chinese (Simplified) | zh-CN | 2052 |
| Chinese (Traditional) | zh-TW | 1028 |
| Croatian | hr-HR | 1050 |
| Czech | cs-CZ | 1029 |
| Danish | da-DK | 1030 |
| Dari | prs-AF | 1164 |
| Dutch | nl-NL | 1043 |
| English | en-US | 1033 |
| Estonian | et-EE | 1061 |
| Finnish | fi-FI | 1035 |
| French | fr-FR | 1036 |
| Galician | gl-ES | 1110 |
| German | de-DE | 1031 |
| Greek | el-GR | 1032 |
| Hebrew | he-IL | 1037 |
| Hindi | hi-IN | 1081 |
| Hungarian | hu-HU | 1038 |
| Indonesian | id-ID | 1057 |
| Irish | ga-IE | 2108 |
| Italian | it-IT | 1040 |
| Japanese | ja-JP | 1041 |
| Kazakh | kk-KZ | 1087 |
| Korean | ko-KR | 1042 |
| Latvian | lv-LV | 1062 |
| Lithuanian | lt-LT | 1063 |
| Macedonian | mk-MK | 1071 |
| Malay | ms-MY | 1086 |
| Norwegian (Bokmål) | nb-NO | 1044 |
| Polish | pl-PL | 1045 |
| Portuguese (Brazil) | pt-BR | 1046 |
| Portuguese (Portugal) | pt-PT | 2070 |
| Romanian | ro-RO | 1048 |
| Russian | ru-RU | 1049 |
| Serbian (Cyrillic, Serbia) | sr-Cyrl-RS | 10266 |
| Serbian (Latin, Serbia) | sr-Latn-RS | 9242 |
| Serbian (Latin) | sr-Latn-CS | 2074 |
| Slovak | sk-SK | 1051 |
| Slovenian | sl-SI | 1060 |
| Spanish | es-ES | 3082 |
| Swedish | sv-SE | 1053 |
| Thai | th-TH | 1054 |
| Turkish | tr-TR | 1055 |
| Ukrainian | uk-UA | 1058 |
| Vietnamese | vi-VN | 1066 |
| Welsh | cy-GB | 1106 |
If you would like to generate this list for your use, please see my script on PnP Script Samples: Generate Markdown Report of LCIDs | PnP Script Samples