| አማርኛ | amh-000 |
| ሴየራ ሌዎን | |
| Afrikaans | afr-000 | Sierra Leone |
| toskërishte | als-000 | Siera Leone |
| العربية | arb-000 | سيراليون |
| luenga aragonesa | arg-000 | Sierra Leone |
| ISO 3166 alpha | art-006 | SL |
| مصري | arz-000 | سييراليون |
| asturianu | ast-000 | Sierra Leona |
| azərbaycanca | azj-000 | Syerra Leone |
| bamanankan | bam-000 | Sera Leon |
| беларуская | bel-000 | Сьера-Леонэ |
| тарашкевіца | bel-001 | С’ера Леонэ |
| বাংলা | ben-000 | সিয়েরা লিওন |
| বাংলা | ben-000 | সিয়েরালিওন |
| bosanski | bos-000 | Sijera Leone |
| বিষ্ণুপ্রিয়া মণিপুরী ভাষা | bpy-000 | সিয়েরা লিওন |
| brezhoneg | bre-000 | Sierra Leone |
| български | bul-000 | Сиера Леоне |
| català | cat-000 | Sierra Leone |
| binisayang Sinugboanon | ceb-000 | Sierra Leone |
| čeština | ces-000 | Sierra Leone |
| 普通话 | cmn-000 | 塞拉利昂 |
| 國語 | cmn-001 | 塞拉利昂 |
| 國語 | cmn-001 | 獅子山 |
| Hànyǔ | cmn-003 | Sài lā lì ang |
| Kernowek | cor-000 | Sierra Leon |
| Qırımtatar tili | crh-000 | Syerra Leone |
| Cymraeg | cym-000 | Sierra Leone |
| dansk | dan-000 | Sierra Leone |
| Deutsch | deu-000 | Republik Sierra Leone |
| Deutsch | deu-000 | Sierra Leone |
| Zazaki | diq-000 | Sierra Leone |
| eesti | ekk-000 | Sierra Leone |
| ελληνικά | ell-000 | Σιέρα Λεόνε |
| ελληνικά | ell-000 | Σιέρρα Λεόνε |
| English | eng-000 | Sierra Leone |
| Esperanto | epo-000 | Siera-Leono |
| Esperanto | epo-000 | Sieraleono |
| Esperanto | epo-000 | sieraleono |
| euskara | eus-000 | Sierra Leona |
| Ɛʋɛgbɛ | ewe-000 | Sierra Leone |
| føroyskt | fao-000 | Sierra Leone |
| suomi | fin-000 | Sierra Leone |
| français | fra-000 | République de Sierra Leone |
| français | fra-000 | Sierra Leone |
| lenga arpitana | frp-000 | Siérra Leone |
| Frysk | fry-000 | Sierra Leöane |
| Fulfulde | ful-000 | Sarliyon |
| Gàidhlig | gla-000 | Siarra Leòmhann |
| Gaeilge | gle-000 | Siarra Leon |
| galego | glg-000 | Serra Leoa |
| galego | glg-000 | Serra Leoa - Sierra Leone |
| yn Ghaelg | glv-000 | Sierra Leone |
| Schwizerdütsch | gsw-000 | Sierra Leone |
| ગુજરાતી | guj-000 | સિએરા લિઓન |
| kreyòl ayisyen | hat-000 | Syera Leòn |
| Srpskohrvatski | hbs-001 | Sijera Leone |
| עברית | heb-000 | סיירה לאונה |
| हिन्दी | hin-000 | सिएरा लिओने |
| हिन्दी | hin-000 | सिएरा लियोन |
| hrvatski | hrv-000 | Sijera Leone |
| magyar | hun-000 | Sierra Leone |
| magyar | hun-000 | Sierra Leone-i Köztársaság |
| արևելահայերեն | hye-000 | Սիերա Լիոնե |
| արևելահայերեն | hye-000 | Սյերա-Լեոնե |
| Ido | ido-000 | Sierra Leone |
| Interlingue | ile-000 | Sierra Leone |
| interlingua | ina-000 | Sierra Leon |
| interlingua | ina-000 | Sierra Leone |
| bahasa Indonesia | ind-000 | Sierra Leone |
| íslenska | isl-000 | Síerra Leóne |
| italiano | ita-000 | Sierra Leone |
| basa Jawa | jav-000 | Sierra Leone |
| 日本語 | jpn-000 | シエラレオネ |
| ಕನ್ನಡ | kan-000 | ಸಿಯೆರ್ರಾ ಲಿಯೋನ್ |
| ქართული | kat-000 | სიერა ლეონე |
| ქართული | kat-000 | სიერა-ლეონე |
| қазақ | kaz-000 | Сиерра-Леоне |
| монгол | khk-000 | Сьерра-Леоне |
| ភាសាខ្មែរ | khm-000 | សេរ៉ាឡេអូន |
| Kurmancî | kmr-000 | Sierra Leone |
| 한국어 | kor-000 | 시에라리온 |
| latine | lat-000 | Mons Leoninus |
| lengua lígure | lij-000 | Sierra Lion |
| lingála | lin-000 | Sierra Leone |
| lietuvių | lit-000 | Siera Leonė |
| lengua lumbarda | lmo-000 | Sierra Leone |
| Lëtzebuergesch | ltz-000 | Sierra Leone |
| latviešu | lvs-000 | Sjerraleone |
| മലയാളം | mal-000 | സീറാ ലിയോണ് |
| मराठी | mar-000 | सियेरा लिओन |
| македонски | mkd-000 | Сиера Леоне |
| Malti | mlt-000 | Sierra Leone |
| reo Māori | mri-000 | Te Araone |
| Bân-lâm-gú | nan-005 | Sierra Leone |
| Diné bizaad | nav-000 | Náshdóítsoh Bitsiijįʼ Daditłʼooʼígíí Bidził |
| Nāhuatlahtōlli | nci-000 | Sierra Leona |
| Plattdüütsch | nds-000 | Sierra Leone |
| Plattdüütsch-Neddersassisch | nds-002 | Sierra Leone |
| Nederlands | nld-000 | Sierra Leone |
| nynorsk | nno-000 | Sierra Leone |
| bokmål | nob-000 | Sierra Leone |
| Novial | nov-000 | Siera Leone |
| occitan | oci-000 | Sierra Leone |
| ирон ӕвзаг | oss-000 | Сьеррæ-Леоне |
| Amanung Sisuan | pam-000 | Sierra Leone |
| پښتو ژبه | pbu-000 | سېراليون |
| فارسی | pes-000 | سیرالئون |
| فارسی | pes-000 | سیرالیون |
| lenga piemontèisa | pms-000 | Sierra Leone |
| polski | pol-000 | Sierra Leone |
| português | por-000 | Serra Leoa |
| Runa Simi | que-000 | Liyun Urqu |
| Qusqu qhichwa simi | quz-000 | Liyun Urqu |
| română | ron-000 | Sierra Leone |
| русский | rus-000 | Сьерра-Леоне |
| саха тыла | sah-000 | Сьерра Леоне |
| संस्कृतम् | san-000 | सियारा-लियोन |
| lingua siciliana | scn-000 | Serra Liuni |
| slovenčina | slk-000 | Sierra Leone |
| slovenščina | slv-000 | Sierra Leone |
| davvisámegiella | sme-000 | Sierra Leone |
| español | spa-000 | Sierra Leona |
| shqip | sqi-000 | Siera Leone |
| sardu | srd-000 | Sierra Leone |
| српски | srp-000 | Сијера Леоне |
| srpski | srp-001 | Sijera Leone |
| basa Sunda | sun-000 | Sierra Leone |
| svenska | swe-000 | Sierra Leone |
| Kiswahili | swh-000 | Sierra Leone |
| Ślůnsko godka | szl-000 | Sierra Leone |
| தமிழ் | tam-000 | சியேரா லியோனி |
| தமிழ் | tam-000 | சீராலியோனி |
| tatar tele | tat-000 | Sierra Leone |
| тоҷикӣ | tgk-000 | Сиерра Леоне |
| Tagalog | tgl-000 | Sierra Leone |
| ภาษาไทย | tha-000 | ประเทศเซียร์ราลีโอน |
| Tok Pisin | tpi-000 | Sierra leone |
| xiTsonga | tso-000 | Sierra Leone |
| Türkçe | tur-000 | Sierra Leone |
| ئۇيغۇرچە | uig-000 | سېررالېئون |
| Uyghurche | uig-001 | Sérraléon |
| українська | ukr-000 | Сʼєра Леоне |
| українська | ukr-000 | Сʼєрра-Леоне |
| українська | ukr-000 | Сьєрра-Леоне |
| українська | ukr-000 | С’єрра-Леоне |
| اردو | urd-000 | سیرالیون |
| oʻzbek | uzn-000 | Siyerra Leon |
| łéngua vèneta | vec-000 | Siera Leon |
| tiếng Việt | vie-000 | Sierra Leone |
| tiếng Việt | vie-000 | Xi-ê-ra Lê-ôn |
| Volapük | vol-000 | Sieraleonän |
| Winaray | war-000 | Sierra Leone |
| kàllaama wolof | wol-000 | Siraa Leyoon |
| èdè Yorùbá | yor-000 | Sierra Leone |
| èdè Yorùbá | yor-000 | Siẹrra Léònè |
| Bahasa Malaysia | zsm-000 | Siera Leon |
| Bahasa Malaysia | zsm-000 | Sierra Leone |