- Afrikaans: vyftiende (abbreviation 15de)
- Armenian: տասնհինգերորդ (hy) (tasnhingerord)
- Basque: hamabosgarren
- Belarusian: пятна́ццаты m (pjatnáccaty)
- Bengali: পঞ্চদশ (pôñcdôś)
- Breton: pemzekvet (br)
- Bulgarian: петнадесети (petnadeseti)
- Catalan: quinzè (ca) m (abbreviation: 15è)
- Crimean Tatar: on beşinci
- Czech: patnáctý (cs)
- Danish: femtende (da) (abbreviation: 15.)
- Dutch: vijftiende (abbreviation 15e)
- Esperanto: dek kvina
- Finnish: viidestoista (fi)
- French: quinzième (before the noun) (abbreviation 15ème); (in names of monarchs and popes) quinze (after the name) (abbreviation XV)
- Georgian: მეთხუთმეტე (metxutmeṭe)
- German: fünfzehnte (abbreviation 15.)
- Hungarian: tizenötödik (hu)
- Irish: an cuigú ... deag
- Italian: quindicesimo m, quindicesima f, (before the noun) (abbreviations 15º m, 15ª f); (in names of monarchs and popes) quindicesimo m, quindicesima f (after the name) (abbreviation XV)
- Kazakh: он бесінші (on besinşi)
- Korean: 열다섯째 (ko) (yeoldaseosjjae)
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- Latin: quintus decimus
- Latvian: piecpadsmitais m
- Luxembourgish: fofzéngt
- Macedonian: петнаесетти (petnaesetti)
- Navajo: ashdlaʼáadah góneʼ
- Norwegian: femtende
- Polish: piętnasty (abbreviation 15.)
- Portuguese: décimo quinto
- Romanian: al cincisprezecelea m, a cincisprezecea f, al cinșpelea (m, informal), a cinșpea (f, informal)
- Russian: пятна́дцатый (ru) (pjatnádcatyj)
- Slovak: pätnásty (sk)
- Spanish: n. or pn. + quinto m, n. or pn. + quinta f, decimoquinto (es) m, decimoquinta f
- Swedish: femtonde (sv)
- Tagalog: pang-labinlima, ikalabinlima
- Tajik: понздаҳум (ponzdahum)
- Telugu: పదిహేనవ (te) (padihēnava)
- Thai: ที่สิบห้า (tîi-sìp-hâa)
- Turkish: on beşinci (abbreviations 15'inci, 15.)
- Ukrainian: п'ятна́дцятий (uk) m (pʺjatnádcjatyj)
- Vietnamese: thứ mười lăm
- West Frisian: fyftjinde
- Yiddish: פֿופֿצנט (fuftsnt)
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