- Afrikaans: een-en-twintig (af)
- Amharic: ሃያ አንድ (haya ʾänd)
- Arabic: وَاحِد وَعِشْرُون (wāḥid wa-ʕišrūn)
- Hijazi Arabic: واحد و عشرين (wāḥid u ʕišrīn)
- Armenian: քսանմեկ (hy) (kʻsanmek)
- Assyrian Neo-Aramaic: ܥܸܣܪܝܼ ܘܚܲܕ݇ m (ʿisrī w-ḥa), ܥܸܣܪܝܼ ܘܚܕܵܐ f (ʿisrī w-ḥdā)
- Azerbaijani: iyirmi bir (az)
- Basque: hogeita bat (eu)
- Belarusian: два́ццаць адзі́н (dváccacʹ adzín)
- Bengali: একুশ (bn) (ekuś)
- Breton: unan-warn-ugent
- Bulgarian: двадесет и едно (dvadeset i edno)
- Burmese: နှစ်ဆယ့်တစ် (hnachcai.tac)
- Catalan: vint-i-un (ca)
- Cebuano: kawhaa`g usa, bayente uno
- Central Sierra Miwok: naˀ·á- kéŋ·e-ˀ hej·i-ˀ
- Chechen: ткъе цхьаъ (tqʼe cḥʳaʔ)
- Cherokee: ᏔᎵᏍᎪ ᏌᏬ (talisgo sawo)
- Chichewa: makumi awiri n'chimodzi
- Chinese:
- Cantonese: 二十一 (ji6 sap6 jat1), 廿一 (yue) (jaa6 jat1)
- Mandarin: 二十一 (zh) (èrshíyī)
- Wu: 廿一 (6gnie-iq)
- Classical Nahuatl: cempōhualli oncē
- Czech: dvacet jedna (cs)
- Danish: enogtyve (da)
- Dhivehi: އެކާވީސް (ekāvīs)
- Dutch: eenentwintig (nl) f
- Esperanto: dudek unu
- Estonian: kakskümmend üks (et)
- Ewe: blaeve vo ɖekɛ
- Faroese: ein og tjúgu
- Fijian: ruasagavulu ka dua
- Finnish: kaksikymmentäyksi (fi)
- French: vingt-et-un (fr) m
- Galician: vinte e un (gl)
- Georgian: ოცდაერთი (ocdaerti)
- German: einundzwanzig (de) f
- Greek: είκοσι ένα (el) (eíkosi éna)
- Gujarati: એકવીસ (gu) (ekavīs)
- Haitian Creole: venteyen
- Hebrew: עשרים־ואחד (esrím və-ekhád)
- Hindi: इक्कीस (hi) (ikkīs)
- Hungarian: huszonegy (hu)
- Icelandic: tuttugu og einn (is)
- Indonesian: dua puluh satu
- Interlingua: vinti-un
- Irish: fiche a haon, aon is fiche
- Italian: ventuno (it)
- Japanese: 二十一 (nijūichi)
- Javanese: salikur (jv), selikur (jv)
- Kannada: ಇಪ್ಪತ್ತೊಂದು (kn) (ippattondu)
- Kazakh: жиырма бір (jiyrma bır)
- Khmer: ម្ភៃមួយ (mpʰey muəy)
- Korean: 스물 하나 (seumul hana)
- Kurdish:
- Central Kurdish: بیست و یەک (bîst û yek)
- Kyrgyz: жыйырма бир (jıyırma bir)
- Lakota: wikčémna núŋpa aké waŋží
- Lao: ຊາວເອັດ (sāo ʼet)
- Latin: viginti unus (la)
- Latvian: divdesmit viens (lv)
- Louisiana Creole French: vin-ché-un
- Lü: ᦌᦱᧁᦵᦀᧆ (saaw˙ʼed)
- Macedonian: два́есет и е́ден (dváeset i éden)
- Malay: dua puluh satu, selikur, satu likur
- Malayalam: ഇരുപത്തൊന്ന് (irupattonnŭ), ഇരുപത്തിയൊന്ന് (irupattiyonnŭ)
- Maltese: wieħed u għoxrin
- Manchu: ᠣᡵᡳᠨ
ᡝᠮᡠ (orin emu)
- Maori: rua tekau mā tahi (mi), rua ngahuru mā tahi (older term)
- Navajo: naadįįłaʼ
- Norwegian:
- Bokmål: tjueen, tjueén
- Nynorsk: tjueein
- Ojibwe: niishtanashi-bezhig
- Old English: ān and twēntiġ
- Pennsylvania German: een un zwansich
- Persian: بیست و یک (bist-o-yek)
- Polish: dwadzieścia jeden (pl)
- Portuguese: vinte e um (pt)
- Punjabi: ਇੱਕੀ (ikkī)
- Quechua: iskay chunka hukniyuq
- Romanian: douăzeci și unu
- Russian: два́дцать оди́н (ru) (dvádcatʹ odín)
- Samoan: luasefulu tasi
- Sanskrit: एकविंशति (sa) (ékaviṃśati)
- Serbo-Croatian:
- Cyrillic: двадесет и један
- Roman: dvadeset i jedan
- Shan: သၢဝ်းဢဵတ်း (sáao ʼáet)
- Slovene: enaindvajset (sl)
- Spanish: veintiuno (es) m
- Swedish: tjugoett (sv), tjugoen
- Sylheti: ꠄꠇꠂꠡ (exoiśo)
- Tagalog: beynte uno, dalawmpu't isa
- Telugu: ఇరవై ఒకటి (iravai okaṭi)
- Thai: ยี่สิบเอ็ด (yîi-sìp-èt)
- Tok Pisin: tupela ten wan
- Tongan: uofulu mā taha
- Turkish: yirmi bir (tr)
- Ukrainian: два́дцять оди́н (dvádcjatʹ odýn)
- Urdu: اکیس (ikkīs)
- Uyghur: يىگىرمە بىر (yigirme bir)
- Vietnamese: hai mươi mốt
- Volapük: teldegbal, telsebal (older term, obsolete)
- Welsh: un ar hugain (vigesimal, traditional), dau ddeg un (cy) (decimal), trisaith (obsolete)
- West Frisian: ienentweintich (fy)
- Yiddish: איין און צוואַנציק (eyn un tsvantsik)
- Yup'ik: yuinaq atauciq
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