- Afrikaans: agtien (af), agttien (af)
- Albanian: tetëmbëdhjetë (sq)
- American Sign Language:
- Amharic: አስራ ስምንት (ʾäsra smntə)
- Arabic: ثَمَانِيَةَ عَشَرَ (ṯamāniyata ʿašara)
- Egyptian Arabic: تمنتاشر (tamantāšar)
- Aramaic:
- Hebrew: תמנעסר m (tmāna‘sar), תמנעסרא f (tmāna‘esrē)
- Syriac: ܬܡܢܥܣܪ m (tmāna‘sar), ܬܡܢܥܣܪܐ f (tmāna‘esrē)
- Armenian: տասնութ (hy) (tasnutʿ)
- Old Armenian: ութեւտասն (utʿewtasn)
- Asturian: dieciocho (ast)
- Aymara: tunka kimsaqallquni
- Azerbaijani: on səkkiz (az)
- Bashkir: ун һигеҙ (un higeð)
- Basque: hemezortzi (eu), hamazortzi (eu)
- Belarusian: васямна́ццаць (vasjamnáccacʹ), васемна́ццаць (vasjemnáccacʹ)
- Bengali: আঠারো (aṭharo) (numeral: ১৮)
- Breton: triwec'h (br)
- Bulgarian: осемна́десет (osemnádeset), осемна́йсет (osemnájset)
- Burmese: ဆယ့်ရှစ် (hcai.hrac) (numeral: ၁၈)
- Buryat: арбан найман (arban najman)
- Catalan: divuit (ca)
- Valencian: díhuit (ca)
- Cebuano: napulog walo, desiotso
- Chechen: берхӏитта (berhitta)
- Cherokee: ᏁᎳᏚ (neladu)
- Chichewa: khumi n'zisanu n'zitatu
- Chinese:
- Cantonese: 十八 (sap6 baat3)
- Hakka: 十八 (sṳ̍p-pat)
- Mandarin: 十八 (zh) (shíbā)
- Chuvash: вунсаккӑр (vunsakkăr), вунсаккăр (vunsakkăr), вунсакăр (vunsakăr)
- Classical Nahuatl: caxtōlli omēyi
- Cree: ᐊᔨᓇᓀᐅᐧᓴᑊ (ayinaneoysap)
- Czech: osmnáct (cs)
- Danish: atten (da)
- Dena'ina: łtaqul'i beq'di
- Dhivehi: އަށާރަ (ashāra)
- Dutch: achttien (nl) f
- Esperanto: dek ok
- Estonian: kaheksateist (et)
- Faroese: átjan
- Fijian: tini ka walu
- Finnish: kahdeksantoista (fi)
- French: dix-huit (fr) m
- Galician: dezaoito (gl)
- Georgian: თვრამეტი (tvrameṭi)
- German: achtzehn (de)
- Gothic: 𐌰𐌷𐍄𐌰𐌿𐍄𐌰𐌹𐌷𐌿𐌽 (ahtautaihun)
- Greek: δεκαοκτώ (el) (dekaoktó)
- Greenlandic: arvirsaniq-pingasut
- Gujarati: અઢાર (gu) (aḍhār)
- Haitian Creole: dizuit
- Hawaiian: ʻumikūmāwalu
- Hebrew: שְׁמוֹנֶה־עֶשְׂרֵה f (shmone esre) (used in counting), שְׁמוֹנָה־עָשָׂר m (shmona asar)
- Hindi: अठारह (hi) (aṭhārah)
- Hopi: pakwt niikyang nanalt siikya’ta
- Hungarian: tizennyolc (hu)
- Icelandic: átján (is), áttján (archaic)
- Ido: dek ed ok (io)
- Inari Sami: käävcinubáloh
- Indonesian: delapan belas (id)
- Interlingua: dece-octo
- Irish: ocht déag
- Italian: diciotto (it)
- Japanese: 十八 (ja) (jūhachi)
- Kannada: ಹದಿನೆಂಟು (kn) (hadineṇṭu)
- Kazakh: он сегіз (kk) (on segiz)
- Khmer: ដប់ប្រាំបី (dop pram bei) (numeral: ១៨)
- Komi-Permyak: даскыкьямыс (daskykʹjamys)
- Korean: 열여덟 (ko) (yeoryeodeol), 십팔 (ko) (sippal) (十八 (ko))
- Kurdish:
- Kurmanji: hejde (ku)
- Sorani: ھەژدە (hejde)
- Kyrgyz: он сегиз (ky) (on segiz)
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- Lakota: akéšagloǧaŋ
- Lao: ສິບແປດ (sip pǣt) (numeral: ໑໘)
- Latin: duodēvīgintī (la)
- Latvian: astoņpadsmit (lv)
- Lithuanian: aštuoniolika (lt)
- Livonian: kōdõkstuoistõn
- Low German: achtteihn
- German Low German: achtteihn
- Luxembourgish: uechtzéng (lb)
- Lü: ᦉᦲᧇᦶᦔᧆᧈ (ṡiibṗaed1) (numeral: ᧑᧘)
- Macedonian: осумна́есет (osumnáeset)
- Malagasy: valo ambinifolo
- Malay: lapan belas, delapan belas, sepuluh lapan, sepuluh delapan, satu puluh lapan, satu puluh delapan
- Maltese: tmintax
- Mansi: нёлловхуйплов (ɲollowxujplow)
- Maori: tekau mā waru (mi)
- Mapudungun: maripura
- Mongolian: арван найм (mn) (arvan najm)
- Navajo: tseebíítsʼáadah
- Norman: dix-huit, dgiêx-huit
- Northern Sami: gávccinuppelohkái
- Norwegian: atten (no)
- Novial: dek-ot
- Ojibwe: ashi-nishwaaswi
- Old Church Slavonic: осмь на дєсѧтє (osmĭ na desęte)
- Oriya: ଅଠର (aṭhar) (numeral: ୧୮ (18))
- Persian: هجده (fa) (hejdah), هیجده (fa) (hijdah)
- Polish: osiemnaście (pl), (collective) osiemnaścioro (pl)
- Portuguese: dezoito (pt)
- Punjabi: ਅਠਾਰਾਂ (pa) (aṭhārāṅ)
- Quechua: chunka pusaqniyuq
- Romanian: optsprezece (ro)
- Romansch: (Grischun) deschdotg
- Russian: восемна́дцать (ru) (vosemnádcatʹ)
- Rusyn: вӱсямна́дцить (vӱsjamnádcytʹ)
- S'gaw Karen: တဆံဃိး (təhsichö)
- Samoan: sefulu valu
- Sanskrit: अष्टादशन् (sa) (aṣṭādaśan)
- Scottish Gaelic: ochd deug
- Serbo-Croatian:
- Cyrillic: осамнаест
- Roman: osamnaest
- Shan: သိပ်းပႅတ်ႇ (síp pàet)
- Sinhalese: දහඅට (dahaaṭa)
- Skolt Sami: käcmlo
- Slovak: osemnásť (sk)
- Slovene: osemnajst (sl)
- Sorbian:
- Lower Sorbian: wósymnasćo
- Upper Sorbian: wósomnaće
- Spanish: dieciocho (es)
- Swedish: arton (sv), aderton (sv) (obsolete, Finnish Swedish)
- Tagalog: labingwalo (tl)
- Tahitian: hō'ē 'ahuru ma va'u
- Tajik: ҳаждаҳ (tg) (haždah)
- Tatar: унсигез (unsigez)
- Telugu: పద్దెనిమిది (te) (paddenimidi)
- Thai: สิบแปด (th) (sìp-bpɛ̀ɛt) (numeral: ๑๘)
- Tibetan: བཅོ་བརྒྱད (bco brgyad)
- Tigre: ዐስር ወሰማን (ʿäsr wäsäman)
- Tigrinya: ዓሰርተ ሸሞንተ (ʿasärtä šämontä)
- Tongan: hongofulu mā valu
- Turkish: on sekiz (tr)
- Turkmen: on sekiz (tk)
- Ukrainian: вісімна́дцять (uk) (visimnádcjatʹ)
- Urdu: اٹھارہ (ur) (aṭhārah)
- Uyghur: ئون سەككىز (ug) (on sekkiz)
- Uzbek: oʻn sakkiz
- Vietnamese: mười tám
- Vilamovian: aochcao
- Volapük: degjöl, balsejöl (older term, obsolete)
- Welsh: deunaw (cy) (vigesimal, traditional), un deg wyth (cy) (decimal)
- West Frisian: achttjin (fy)
- Wolof: fukk ak juróom ñett
- Yakut: уон аҕыс (uon ağıs)
- Yiddish: אַכצן (akhtsn)
- Yup'ik: akimiaq pingayun
- Zhuang: cib bet
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