- Afrikaans: dertig (af)
- Albanian: tridhjetë (sq)
- American Sign Language:
- Amharic: ሠላሳ (śälasa)
- Arabic: ثَلَاثِينَ (ṯalāṯīna), (only nominative, formal) ثَلَاثُونَ (ṯalāṯūna), (numeral) ٣٠ (30)
- Egyptian Arabic: تلاتين (talatīn)
- Aragonese: trenta
- Aramaic:
- Hebrew: תלתין c (tlāthīn)
- Syriac: ܬܠܬܝܢ c (tlāthīn)
- Armenian: երեսուն (hy) (eresun)
- Aromanian: treidzãts, treidzãtsi, tridzãts
- Assamese: ত্রিছ
- Asturian: trenta (ast)
- Avar: лъеберго (lˢebergo)
- Azerbaijani: otuz (az)
- Bashkir: утыҙ (utıź)
- Basque: hogeita hamar (eu)
- Belarusian: тры́ццаць (be) (trýccacʹ)
- Bengali: ত্রিশ (bn) (triś), তিরিশ (bn) (tiriś)
- Bikol Central: tulompulo
- Breton: tregont (br)
- Bulgarian: три́десет (trídeset), три́йсет (tríjset)
- Burmese: သုံးဆယ် (sum:hcai), (numeral) ၃၀ (30)
- Carpathian Rusyn: три́дцять (trýdcjatʹ)
- Catalan: trenta (ca)
- Central Dusun: tolu nohopod
- Chamorro: trenta
- Chechen: ткъе итт (tqʼe itt)
- Cherokee: ᏔᎵᏍᎪ ᏐᏁᎳ (talisgo sonela)
- Chichewa: makumi atatu
- Chinese:
- Cantonese: 三十 (saam1 sap6), 卅 (saa1), 卅呀 (saa1 aa6)
- Mandarin: 三十 (zh) (sānshí)
- Wu: 三十 (1se-zeq8)
- Chuukese: inik
- Chuvash: вӑтӑр (văt̬ăr)
- Classical Nahuatl: cempōhualli ommahtlāctli
- Crimean Tatar: otuz
- Czech: třicet (cs)
- Dalmatian: tranta
- Danish: tredive (da), tredve
- Dhivehi: ތިރީސް (tirīs)
- Dupaningan Agta: tallupulu
- Dutch: dertig (nl) f
- Dzongkha: སུམ་ཅུ (sum cu)
- Esperanto: tridek (eo)
- Estonian: kolmkümmend (et)
- Farefare: pistã
- Faroese: tretivu, tríati
- Fijian: tolusagavulu
- Finnish: kolmekymmentä (fi)
- French: trente (fr) m
- Friulian: trente
- Galician: trinta (gl)
- Ge'ez: ሠላሳ (śälasa)
- Georgian: ოცდაათი (ocdaati)
- German: dreißig (de) f
- Middle High German: drīȥic
- Gothic: 𐌸𐍂𐌴𐌹𐍃 𐍄𐌹𐌲𐌾𐌿𐍃 (þreis tigjus)
- Greek: τριάντα (el) (triánta)
- Ancient: τριάκοντα (triákonta), λ΄ (numeral)
- Gujarati: ત્રીસ (gu) (trīs)
- Haitian Creole: trant
- Hausa: talatin
- Hawaiian: kanakolu
- Hebrew: שְׁלוֹשִׁים m or f (shloshím)
- Hindi: तीस (hi) (tīs), त्रिंशत् (hi) (triñśat)
- Hungarian: harminc (hu)
- Icelandic: þrjátíu (is)
- Ido: triadek (io)
- Indonesian: tiga puluh (id)
- Ingrian: koltkymment
- Interlingua: trenta
- Irish: tríocha (ga)
- Middle Irish: trícha
- Old Irish: trícho
- Italian: trenta (it)
- Japanese: 三十 (ja) (さんじゅう, sanjū)
- Kannada: ಮೂವತ್ತು (kn) (mūvattu)
- Karachay-Balkar: отуз (otuz)
- Kazakh: отыз (kk) (otyz)
- Khmer: សាមសិប (km) (saam səp), (numeral) ៣០ (km) (30)
- Komi-Permyak: куимдас (kuimdas)
- Korean: 삼십(三十) (ko) (samsip), 서른 (ko) (seoreun)
- Kurdish:
- Central Kurdish: سی (sî)
- Northern Kurdish: sî (ku), sih (ku)
- Kyrgyz: отуз (ky) (otuz)
- Ladin: trenta
- Lakota: wikčémna yámni
- Lao: ສາມສິບ (sām sip)
- Latin: trīginta (la)
- Latvian: trīsdesmit (lv)
- Lithuanian: trisdešimt (lt)
- Livonian: kuolmkimdõ
- Louisiana Creole French: trent
- Lü: ᦉᦱᧄᦉᦲᧇ (ṡaamṡiib)
- Luxembourgish: drësseg
- Macedonian: три́есет (tríeset)
- Malay: tiga puluh (ms), telu puluh
- Malayalam: മുപ്പത് (ml) (muppatŭ)
- Maltese: tletin
- Manchu: ᡤᡡᠰᡳᠨ (gūsin)
- Manx: jeih as feed
- Maore Comorian: thalathini
- Maori: toru tekau (mi)
- Marathi: तीस (tīs)
- Mongolian: гуч (mn) (guč)
- Nauruan: ama
- Navajo: tádiin
- Norman: trente
- North Frisian: dörtig (Sylt)
- Northern Mansi: (please verify) ва̄т (wāt)
- Norwegian:
- Bokmål: tredve, tretti (no)
- Nynorsk: tretti (no)
- Occitan: trenta (oc)
- Odia: please add this translation if you can
- Ojibwe: nisimidana
- Old Church Slavonic: триѥ дєсѧтє (trije desęte)
- Old English: þrītiġ
- Oromo: sodoma
- Pashto: دیرش (dērš)
- Pennsylvania German: dreissich
- Persian: سی (fa) (si)
- Polish: trzydzieści (pl)
- Portuguese: trinta (pt)
- Quechua: kimsa chunka
- Romagnol: trènta
- Romanian: treizeci (ro)
- Romansch: trenta, trainta
- Russian: три́дцать (ru) (trídcatʹ)
- Samoan: tolusefulu
- Sanskrit: त्रिंशत् (sa) (triṃśat)
- Santali: ᱯᱮ ᱜᱮᱞ (pe gel), ᱢᱤᱫ ᱤᱥᱤ ᱜᱮᱞ (mit’ isi gel)
- Sardinian: trinta
- Scottish Gaelic: (old system) deug air fhichead, (new system) trìthead
- Serbo-Croatian:
- Cyrillic: тридесет
- Roman: trideset
- Shan: သၢမ်သိပ်း (shn) (sǎam síp)
- Sicilian: trena
- Sinhalese: තිහ (tiha)
- Slovak: tridsať (sk)
- Slovene: trideset (sl)
- Sorbian:
- Lower Sorbian: tśiźasća
- Upper Sorbian: třiceći
- Southern Altai: одус (odus), отус (otus)
- Spanish: treinta (es)
- Swahili: thelathini (sw)
- Swedish: trettio (sv)
- Tagalog: tatlumpu (tl)
- Tahitian: toru 'ahuru
- Tajik: си (si)
- Tatar: утыз (tt) (utız)
- Telugu: ముప్ఫై (mupphai)
- Thai: สามสิบ (th) (sǎam-sìp)
- Tigrinya: ሰላሳ (sälasa)
- Tocharian B: täryāka
- Tok Pisin: teti, tripela ten
- Tongan: tolungofulu
- Turkish: otuz (tr)
- Turkmen: otuz (tk)
- Ukrainian: три́дцять (uk) (trýdcjatʹ), три́йцять (trýjcjatʹ)
- Unami: xintxke
- Urdu: تیس (tīs)
- Uyghur: ئوتتۇز (ottuz)
- Uzbek: o‘ttiz (uz)
- Venetian: trenta (vec)
- Vietnamese: ba mươi (vi)
- Vilamovian: dresig
- Volapük: kildeg (vo), kils (older term, obsolete)
- Welsh: trideg (cy), deg ar hugain (cy) (vigesimal, traditional), tri deg (decimal)
- West Frisian: tritich (fy)
- Written Oirat: ᡎᡇᡔᡅᠨ (ɣucin)
- Yakut: отут (otut)
- Yiddish: דרײַסיק (draysik)
- Yup'ik: yuinaq qula
- Zulu: please add this translation if you can
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