- Afrikaans: tagtig (af)
- Albanian: tetëdhjetë (sq)
- Arabic: ثَمَانِينَ (ṯamānīna), (only nominative, formal) ثَمَانُونَ (ṯamānūna)
- Egyptian Arabic: تمنين (tamanīn)
- Aramaic:
- Hebrew: תמנאין c (tmān'īn)
- Syriac: ܬܡܢܐܝܢ c (tmān'īn)
- Armenian: ութսուն (hy) (utʿsun)
- Aromanian: opdzãts, optdzãtsi, ubdzãts
- Asturian: ochenta (ast)
- Avar: ункъого (unqxʼogo)
- Azerbaijani: səksən (az)
- Bashkir: һикһән (hikhän)
- Basque: laurogei (eu)
- Belarusian: во́семдзесят (vósjemdzjesjat)
- Bengali: আশি (bn) (aśi)
- Bikol Central: walompulo
- Breton: pevar-ugent (br)
- Bulgarian: осемдесе́т (osemdesét)
- Burmese: ရှစ်ဆယ် (hrachcai)
- Catalan: vuitanta (ca)
- Valencian: huitanta (ca)
- Chechen: дезткъа (deztqʼa)
- Cherokee: ᏧᏁᎳᏍᎪᎯ (tsunelasgohi)
- Chichewa: makumi asanu ndiatatu
- Chinese:
- Mandarin: 八十 (zh) (bāshí)
- Wu: 八十 (pat zoep)
- Cree: ᐊᔨᓇᓀᐅᐧᒼᑕᓇᐤ (ayinaneoymtanaw)
- Crimean Tatar: seksen
- Czech: osmdesát (cs)
- Dalmatian: otuonta, octuanta, otuant
- Danish: firs (da), firsindstyve (formal)
- Dhivehi: އާހި (āhi), އަށްދިހަ (aṣ̊diha)
- Dutch: tachtig (nl) f
- Dzongkha: བརྒྱད་ཅུ (brgyad cu)
- East Central German: achzsch
- Esperanto: okdek (eo)
- Estonian: kaheksakümmend (et)
- Faroese: áttati, fýrs
- Fijian: walusagavulu
- Finnish: kahdeksankymmentä (fi)
- French:
- (All French-speaking countries except part of Switzerland and Acadia) quatre-vingts (fr)
- (former word, Switzerland) octante (fr)
- (part of Switzerland, Acadia) huitante (fr)
- Friulian: otante
- Galician: oitenta (gl)
- Georgian: ოთხმოცი (otxmoci)
- German: achtzig (de) f
- Gothic: 𐌰𐌷𐍄𐌰𐌿𐍄𐌴𐌷𐌿𐌽𐌳 (ahtautēhund)
- Greek: ογδόντα (el) (ogdónta)
- Ancient: ὀγδοήκοντα (ogdoḗkonta), π΄ (p΄) (numeral)
- Hausa: tamanin
- Hawaiian: kanawalu
- Hebrew: שְׁמוֹנִים m or f (shmoním)
- Hindi: अस्सी (hi) (assī)
- Hungarian: nyolcvan (hu)
- Ido: okadek (io)
- Indonesian: delapan puluh
- Ingrian: kaheksankymment
- Interlingua: octanta
- Irish: ochtó (ga)
- Old Irish: ochtmoga
- Italian: ottanta (it)
- Japanese: 八十 (ja) (はちじゅう, hachijū)
- Karachay-Balkar: сексен (seksen)
- Kazakh: сексен (kk) (seksen)
- Khmer: ប៉ែតសិប (km) (pɐət səp)
- Komi-Permyak: кыкьямысдас (kykʹjamysdas)
- Korean: 팔십(八十) (ko) (palsip), 여든 (ko) (yeodeun)
- Kumyk: сексен (seksen)
- Kurdish:
- Central Kurdish: ھەشتا (ckb) (heşta)
- Kyrgyz: сексен (ky) (seksen)
- Ladin: otanta
- Lakota: wikčémna šaglóǧaŋ
- Lao: ແປດສິບ (pǣt sip)
- Latin: octōgintā (la)
- Latvian: astoņdesmit (lv)
- Ligurian: ottanta
- Lithuanian: aštuoniasdešimt (lt)
- Livonian: kōdõkskimdõ
- Lombard: vottanta
- Louisiana Creole French: katre-vin
- Low German: achttig (etymological spelling), achtig, tachentig
- Luxembourgish: achtzeg (lb), uechtzeg
- Macedonian: осумдесет (osumdeset)
- Malay: lapan puluh (ms)
- Malayalam: എൺപത് (ml) (eṇpatŭ)
- Maltese: tmenin
- Manchu: ᠵᠠᡴᡡᠨᠵᡠ (jakūnju)
- Mansi: нёлсат (nëlsat)
- Manx: kiare feed
- Maori: waru tekau (mi)
- Mongolian: ная (mn) (naja)
- Nauruan: aojomo
- Navajo: tseebídiin
- Norman: huiptante, quatre-vîngts
- Norwegian: åtti (no)
- Occitan: ochanta (oc)
- Ojibwe: nishwaasimidana
- Old Church Slavonic: осмь дєсѧтъ (osmĭ desętŭ)
- Old English: hundeahtatiġ
- Oromo: saddeettama
- Pennsylvania German: achtzich
- Persian: هشتاد (fa) (haštâd)
- Piedmontese: otanta
- Polish: osiemdziesiąt (pl)
- Portuguese: oitenta (pt)
- Quechua: pusaq chunka
- Romagnol: utànta
- Romanian: optzeci (ro)
- Romansch: otganta, otgonta, otgànta, ochaunta, ottanta
- Russian: во́семьдесят (ru) (vósemʹdesjat)
- Rusyn: вӱсӱмдеся́ть (vüsümdesjátʹ)
- Samoan: valusefulu
- Sanskrit: अशीति (sa) (aśītí)
- Santali: ᱤᱨᱟᱹᱞ ᱜᱮᱞ (irăl gel)
- Sardinian: otanta
- Scottish Gaelic: (old system) ceithir fichead, (new system) ochdad
- Serbo-Croatian:
- Cyrillic: осамдесет
- Roman: osamdeset
- Shan: ပႅတ်ႇသိပ်း (pèt síp)
- Sicilian: ottanta (scn), uttanta (scn)
- Sinhalese: අසූව (asūwa)
- Slovak: osemdesiat (sk)
- Slovene: osemdeset (sl)
- Somali: Sideedan
- Southern Altai: сегизен (segizen)
- Spanish: ochenta (es)
- Swahili: themanini (sw)
- Swedish: åttio (sv)
- Tagalog: walumpu, otsenta
- Tahitian: va'u 'ahuru
- Tajik: хаштод (xaštod)
- Tatar: сиксән (tt) (siksän)
- Telugu: ఎనభై (te) (enabhai)
- Thai: แปดสิบ (th) (bpɛ̀ɛt-sìp)
- Tibetan: བརྒྱད་ཅུ (brgyad cu)
- Tongan: valungofulu
- Turkish: seksen (tr)
- Turkmen: segsen (tk)
- Udmurt: тямыстон (ťamyston)
- Ukrainian: ві́сімдесят (uk) (vísimdesjat)
- Unami: xash txinxke
- Urdu: اسی (assī)
- Uyghur: سەكسەن (seksen)
- Uzbek: sakson (uz)
- Venetian: otanta (vec)
- Vietnamese: tám mươi (vi)
- Vilamovian: aochcig
- Volapük: jöldeg (vo)
- Walloon: ûtante (wa), cwatru-vint (wa)
- Welsh: (vigesimal, traditional) pedwar ugain (cy), (decimal) wyth deg (cy)
- West Frisian: tachtich
- Yiddish: אַכציק (akhtsik)
- Yup'ik: yuinaat cetaman
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