| नेपाली | npi-000 |
| सिएर्रा लिओन | |
| Afrikaans | afr-000 | Sierra Leone |
| Aghem | agq-000 | Silìa lûŋ |
| Akan | aka-000 | Sierra Leone |
| toskërishte | als-000 | Siera-Leone |
| አማርኛ | amh-000 | ሴራሊዮን |
| العربية | arb-000 | سيراليون |
| ISO 3166 alpha | art-006 | SL |
| UN M.49 | art-279 | 694 |
| Kipare | asa-000 | Thiera Leoni |
| asturianu | ast-000 | Sierra Lleona |
| azərbaycanca | azj-000 | Siera Leon |
| azərbaycanca | azj-000 | Syerra-Leone |
| Азәрбајҹан дили | azj-001 | Сјерра-Леоне |
| bamanankan | bam-000 | Siyera Lewɔni |
| ɓàsàa | bas-000 | Sièra Lèɔ̂n |
| беларуская | bel-000 | Сьера-Леонэ |
| বাংলা | ben-000 | সিয়েরালিওন |
| Ekibena | bez-000 | Husiela Lioni |
| བོད་སྐད་ | bod-000 | སེ་ཡར་ར། ལིའོན། |
| bosanski | bos-000 | Sijera Leone |
| босански | bos-001 | Сијера Леоне |
| brezhoneg | bre-000 | Sierra Leone |
| बरʼ | brx-000 | सियेरा लेओन |
| български | bul-000 | Сиера Леоне |
| català | cat-000 | Sierra Leone |
| čeština | ces-000 | Sierra Leone |
| Rukiga | cgg-000 | Sirra Riyooni |
| нохчийн мотт | che-000 | Сьерра- Леоне |
| ᏣᎳᎩ ᎧᏬᏂᎯᏍᏗ | chr-000 | ᏏᎡᎳ ᎴᎣᏂ |
| سۆرانی | ckb-000 | سیەرالیۆن |
| 普通话 | cmn-000 | 塞拉利昂 |
| 國語 | cmn-001 | 獅子山 |
| 香港官話 | cmn-021 | 塞拉利昂 |
| Cymraeg | cym-000 | Sierra Leone |
| dansk | dan-000 | Sierra Leone |
| Kitaita | dav-000 | Siera Leoni |
| Deutsch | deu-000 | Sierra Leone |
| zarmaciine | dje-000 | Seera Leon |
| dolnoserbska reč | dsb-000 | Sierra Leone |
| Jóola-Fóoñi | dyo-000 | Serra Leon |
| རྫོང་ཁ་ | dzo-000 | སི་ར་ ལི་འོན |
| Kĩembu | ebu-000 | Siera Leoni |
| eesti | ekk-000 | Sierra Leone |
| ελληνικά | ell-000 | Σιέρα Λεόνε |
| English | eng-000 | Sierra Leone |
| 𐐀𐑍𐑊𐐮𐑇 | eng-006 | 𐐝𐐨𐐯𐑉𐐲 𐐢𐐨𐐬𐑌 |
| Esperanto | epo-000 | Siera-Leono |
| euskara | eus-000 | Sierra Leona |
| Ɛʋɛgbɛ | ewe-000 | Sierra Leone nutome |
| ewondo | ewo-000 | Sierá-leónə |
| føroyskt | fao-000 | Sierra Leona |
| Wikang Filipino | fil-000 | Sierra Leone |
| suomi | fin-000 | Sierra Leone |
| français | fra-000 | Sierra Leone |
| Frysk | fry-000 | Sierra Leone |
| Pulaar | fuc-000 | Seraa liyon |
| Fulfulde | ful-000 | Seraa liyon |
| lenghe furlane | fur-000 | Sierra Leone |
| Gàidhlig | gla-000 | Siarra Leòmhann |
| Gaeilge | gle-000 | Siarra Leon |
| galego | glg-000 | Serra Leoa |
| Schwizerdütsch | gsw-000 | Sierra Leoone |
| ગુજરાતી | guj-000 | સીએરા લેઓન |
| Ekegusii | guz-000 | Siera Leoni |
| Hausa | hau-000 | Salewo |
| עברית | heb-000 | סיירה לאונה |
| हिन्दी | hin-000 | सिएरा लियोन |
| hrvatski | hrv-000 | Sijera Leone |
| hornjoserbšćina | hsb-000 | Sierra Leone |
| magyar | hun-000 | Sierra Leone |
| արևելահայերեն | hye-000 | Սիեռա Լեոնե |
| արևելահայերեն | hye-000 | Սիերա Լեոնե |
| interlingua | ina-000 | Sierra Leone |
| bahasa Indonesia | ind-000 | Sierra Leone |
| íslenska | isl-000 | Síerra Leóne |
| italiano | ita-000 | Sierra Leone |
| Nda’a | jgo-000 | Siyɛ́la Lɛɔ̂n |
| Kimachame | jmc-000 | Siera Leoni |
| 日本語 | jpn-000 | シエラレオネ |
| Taqbaylit | kab-000 | Sira Lyun |
| kalaallisut | kal-000 | Sierra Leone |
| Kĩkamba | kam-000 | Siera Leoni |
| ಕನ್ನಡ | kan-000 | ಸಿಯೆರ್ರಾ ಲಿಯೋನ್ |
| كأشر | kas-000 | سیٖرالیوون |
| ქართული | kat-000 | სიერა-ლეონე |
| қазақ | kaz-000 | Сьерра-Леоне |
| Chimakonde | kde-000 | Siela Leoni |
| kriolu kabuverdianu | kea-000 | Sera Lioa |
| монгол | khk-000 | Сьерра-Леоне |
| ភាសាខ្មែរ | khm-000 | សេរ៉ាឡេអូន |
| Koyra Chiini | khq-000 | Seera Leon |
| Gĩkũyũ | kik-000 | Siera Leoni |
| кыргыз | kir-000 | Сьерра-Леоне |
| Kalenjin | kln-000 | Emetab Sierra Leone |
| 한국어 | kor-000 | 시에라리온 |
| Kishambaa | ksb-000 | Siela Leoni |
| rikpa | ksf-000 | syɛraleon |
| Kölsch | ksh-000 | Sjärra Lejone |
| Kɨlaangi | lag-000 | Seraleóoni |
| ລາວ | lao-000 | ເຊຍຣາ ລີໂອນ |
| lingála | lin-000 | Siera Leonɛ |
| lietuvių | lit-000 | Siera Leonė |
| Lëtzebuergesch | ltz-000 | Sierra Leone |
| Tshiluba | lub-000 | Siera Leone |
| Oluganda | lug-000 | Siyeralewone |
| Dholuo | luo-000 | Sierra Leone |
| Oluluyia | luy-000 | Siera Leoni |
| latviešu | lvs-000 | Sjerraleone |
| മലയാളം | mal-000 | സിയെറ ലിയോൺ |
| मराठी | mar-000 | सिएरा लिओन |
| ɔl Maa | mas-000 | Siera Leoni |
| Kĩmĩrũ | mer-000 | Siera Leoni |
| morisyin | mfe-000 | Sierra Leone |
| македонски | mkd-000 | Сиера Леоне |
| Malti | mlt-000 | Sierra Leone |
| mundaŋ | mua-000 | Sierra Leonǝ |
| မြန်မာဘာသာ | mya-000 | ဆီယာရာ လီယွန်း |
| မြန်မာဘာသာ | mya-000 | ဆီအဲရာ လီအိုနီ |
| مازرونی | mzn-000 | سیرالئون |
| Nàmá | naq-000 | Sierra Leone |
| isiNdebele | nde-000 | Sierra Leone |
| Plattdüütsch | nds-000 | Sierra Leone |
| Nederlands | nld-000 | Sierra Leone |
| Kwasio | nmg-000 | Sierra Leɔn |
| nynorsk | nno-000 | Sierra Leone |
| bokmål | nob-000 | Sierra Leone |
| Runyankore | nyn-000 | Sirra Riyooni |
| ଓଡ଼ିଆ | ory-000 | ସିଓରା ଲିଓନ୍ |
| ਪੰਜਾਬੀ | pan-000 | ਸਿਏਰਾ ਲਿਓਨ |
| فارسی | pes-000 | سیرالئون |
| fiteny Malagasy | plt-000 | Sierra Leone |
| polski | pol-000 | Sierra Leone |
| português | por-000 | Serra Leoa |
| زبان دری | prs-000 | سیرالیون |
| Runa Simi | que-000 | Sierra Leona |
| Kihorombo | rof-000 | Siera Leoni |
| lingua rumantscha | roh-000 | Sierra Leone |
| română | ron-000 | Sierra Leone |
| Kirundi | run-000 | Siyeralewone |
| русский | rus-000 | Сьерра-Леоне |
| Kiruwa | rwk-000 | Siera Leoni |
| Sängö | sag-000 | Sierä-Leône |
| Samburu | saq-000 | Siera Leoni |
| Ishisangu | sbp-000 | Siela Liyoni |
| cisena | seh-000 | Serra Leoa |
| Koyraboro senni | ses-000 | Seera Leon |
| Tacelḥit | shi-001 | ssiralyun |
| ⵜⴰⵛⵍⵃⵉⵜ | shi-003 | ⵙⵙⵉⵔⴰⵍⵢⵓⵏ |
| සිංහල | sin-000 | සියරාලියෝන් |
| slovenčina | slk-000 | Sierra Leone |
| slovenščina | slv-000 | Sierra Leone |
| davvisámegiella | sme-000 | Sierra Leone |
| anarâškielâ | smn-000 | Sierra Leone |
| chiShona | sna-000 | Sierra Leone |
| Soomaaliga | som-000 | Siraaliyoon |
| español | spa-000 | Sierra Leona |
| српски | srp-000 | Сијера Леоне |
| srpski | srp-001 | Sijera Leone |
| svenska | swe-000 | Sierra Leone |
| Kiswahili | swh-000 | Siera Leoni |
| தமிழ் | tam-000 | சியாரா லியோன் |
| tatar tele | tat-000 | Сьерра-Леоне |
| తెలుగు | tel-000 | సియెర్రా లియాన్ |
| Ateso | teo-000 | Siera Leoni |
| тоҷикӣ | tgk-000 | Сиерра-Леоне |
| ภาษาไทย | tha-000 | เซียร์ราลีโอน |
| ትግርኛ | tir-000 | ሴራሊዮን |
| lea fakatonga | ton-000 | Siela Leone |
| Türkçe | tur-000 | Sierra Leone |
| Tásàwàq | twq-000 | Seera Leon |
| Tamaziɣt | tzm-001 | Siralyun |
| ئۇيغۇرچە | uig-000 | سېررالېئون |
| українська | ukr-000 | Сьєрра-Леоне |
| اردو | urd-000 | سیئر لیون |
| oʻzbek | uzn-000 | Syerra-Leone |
| Ўзбекча | uzn-001 | Сьерра-Леоне |
| ꕙꔤ | vai-000 | ꔋꕩ ꕒꕌꖺ ꕸꖃꔀ |
| Vai | vai-001 | Gbeya Bahawɔ |
| tiếng Việt | vie-000 | Sierra Leone |
| Kyivunjo | vun-000 | Siera Leoni |
| Walser | wae-000 | Sierra Leone |
| kàllaama wolof | wol-000 | Siyera Lewon |
| Lusoga | xog-000 | Siyeralewone |
| nuasúɛ | yav-000 | sieláleyɔ́ɔn |
| ייִדיש | ydd-000 | סיערע לעאנע |
| èdè Yorùbá | yor-000 | Orílẹ́ède Siria looni |
| èdè Yorùbá Orílẹ̀-èdè Olómìnira ilẹ̀ Benin | yor-011 | Orílɛ́ède Siria looni |
| 廣東話 | yue-000 | 獅子山 |
| ⵜⴰⵎⴰⵣⵉⵖⵜ | zgh-000 | ⵙⵙⵉⵔⴰⵍⵢⵓⵏ |
| Bahasa Malaysia | zsm-000 | Sierra Leone |
| isiZulu | zul-000 | i-Sierra Leone |