- 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
- Cornish:deg warn ugens
- 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 orf(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)
- Khiamniungan Naga:āusám
- 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
- Ladino:
- Hebrew:טרינטה
- Roman: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 Altai:отыс(otïs)
- Northern Mansi:(pleaseverify)ва̄т(vāt)
- 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:دېرش(derš)
- 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)deugair 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)
- 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)
- Venetan: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)
- Yucatec Maya:lajun tu kaʼakʼáal
- Yup'ik:yuinaq qula
- Zulu:please add this translation if you can
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