- Afar: hal
- Afrikaans: 'n (af)
- Akkala Sami: not used in Akkala Sami
- Albanian: një (sq)
- American Sign Language: not used in American Sign Language
- Arabic: not used in Arabic
- Egyptian Arabic: not used in Egyptian Arabic
- Aragonese: un m, una f
- Armenian: մը (hy) (mə) (Western Armenian), մըն (mən) (Western Armenian, before a vowel)
- Asturian: un (ast) m, una (ast) f
- Bakhtiari: یه (ya), یه -ی (ya -i)
- Bashkir: often not used, бер (ber)
- Basque: bat (eu)
- Belarusian: not used in Belarusian
- Belizean Creole: wahn, ahn
- Breton: un (br) (before the letters n, d, t and h), ul (br) (before the letter l), ur (br) (before other letters)
- Burmese: not used in Burmese
- Catalan: un (ca) m, una (ca) f
- Chinese:
- Mandarin: not used in Mandarin
- Cornish: not used in Cornish
- Czech: not used in Czech
- Danish: en (da) c, et (da) n
- Dutch: een (nl)
- East Central German: aa
- Esperanto: not used in Esperanto (but when necessary to express indefiniteness:) iu (eo) (some)
- Estonian: not used in Estonian
- Faroese: ein (fo) f, eitt n
- Fijian: e dua na (fj)
- Finnish: not used in Finnish
- French: un (fr) m, une (fr) f
- Friulian: un m, une f
- Galician: un (gl) m, unha (gl) f
- Georgian: not used in Georgian, ერთ-ერთი (ert-erti) (not an article, but used for indicating „one among others“)
- German: ein (de) m or n, eine (de) f
- Alemannic German: en m, e f, es n
- Greek: ένας (el) (énas), μια (el) f (mia)
- Ancient Greek: not used in Ancient Greek
- Haitian Creole: yon
- Hawaiian: he
- Hebrew: (usually omitted; sometimes:) אחד (he) (ekhád) (one)
- Hindi: (usually omitted; sometimes:) एक (hi) (ek) (one)
- Huave: nop
- Hungarian: egy (hu)
- Icelandic: not used in Icelandic
- Ido: not used in Ido
- Inari Sami: not used in Inari Sami
- Indonesian: sebuah (id), seorang (id)
- Ingrian: not used in Ingrian
- Interlingua: un (ia)
- Irish: not used in Irish
- Old Irish: not used in Old Irish
- Istriot: oûn m, oûna f
- Italian: un (it) m, uno (it) m, una (it) f, un' (it) f (before a vowel)
- Japanese: not used in Japanese
- Jeju: not used in Jeju
- Kannada: ಒಂದು (kn) (ondu)
- Karelian: not used in Karelian
- Kemi Sami: not used in Kemi Sami
- Kildin Sami: not used in Kildin Sami
- Korean: not used in Korean
- Kurdish:
- Northern Kurdish: yek (ku), -ek (ku), -yek (ku)
- Latin: not used in Latin (Old, Classical, Late, New Latin, sometimes in Medieval Latin); unus (la) (sometimes in Medieval Latin)
- Ligurian: un m, 'n m, ùnn-a f, 'na f
- Limburgish: 'n (li) f, ene (li) m, e (li) n
- Lithuanian: not used in Lithuanian
- Livonian: not used in Livonian
- Louisiana Creole French: un, in, unn, ènn
- Low German: een (nds), en (nds), ein
- Ludian: not used in Ludian
- Lule Sami: not used in Lule Sami
- Luxembourgish: eng (lb)
- Macedonian: not used in Macedonian
- Malay: not used in Malay
- Manx: not used in Manx
- Maori: he
- Middle English: a (primarily before a consonant), an (primarily before a vowel)
- Mirandese: un m, ũa f
- Mòcheno: a m (nominative) and f and n, an m (oblique)
- Northern Sami: not used in Northern Sami
- Norwegian:
- Bokmål: en (no) m, ei (no) f, et (no) n
- Nynorsk: ein (nn) m, ei (nn) f, eit n
- Occitan: un (oc) m, una (oc) f, ua (oc) f (Gascon)
- Old English: not used in Old English
- Pennsylvania German: en
- Persian:
- Dari Persian: یک (fa) (yak), ـی (-ē), یه (ya) (colloquial)
- Iranian Persian: یک (fa) (yek), -ی (fa) (-i), یک -ی (yek -i), یه (ye) (colloquial), یه -ی (ye -i) (colloquial)
- Pite Sami: not used in Pite Sami
- Polish: not used in Polish
- Portuguese: um (pt) m, uma (pt) f
- Romani: jekh
- Romanian: un (ro) m or n, o (ro) f
- Russian: not used in Russian
- Sanskrit: not used in Sanskrit
- Scottish Gaelic: not used in Scottish Gaelic
- Serbo-Croatian: not used in Serbo-Croatian
- Skolt Sami: not used in Skolt Sami
- Slovak: not used in Slovak
- Slovene: not used in Slovene
- Sorbian:
- Lower Sorbian: not used in Lower Sorbian
- Upper Sorbian: not used in Upper Sorbian
- Southern Sami: not used in Southern Sami
- Spanish: un (es) m, una (es) f
- Swahili: not used in Swahili
- Swedish: en (sv) c, ett (sv) n
- Tagalog: (describe the quantity of something) isang (tl)
- Tamil: (used before the noun) ஒரு (ta) (oru), ஒன்று (ta) (oṉṟu) (used after the noun)
- Telugu: ఒక (te) (oka)
- Ter Sami: not used in Ter Sami
- Thai: หนึ่ง (th) (nʉ̀ng)
- Tok Pisin: wanpela (tpi)
- Turkish: not used in Turkish, bir (tr), bi', bi (tr)
- Tz'utujil: jun
- Ukrainian: not used in Ukrainian
- Ume Sami: not used in Ume Sami
- Veps: not used in Veps
- Vietnamese: not used in Vietnamese
- Volapük: (♂♀, animate or inanimate, extremely rare, usually not translated) un, (♂, extremely rare, usually not translated) hiun, (♀, extremely rare, usually not translated) jiun
- Võro: not used in Võro
- Votic: not used in Votic
- Walloon: on (wa) m, ene (wa) f, èn (wa) m (before vowel)
- Welsh: not used in Welsh
- Middle Welsh: not used in Middle Welsh
- West Frisian: in (fy)
- Wolof: ab (wo)
- Yiddish: אַ (yi) (a), אַן (an)
- Yoruba: not used in Yoruba
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