- Afrikaans: tweeling
- Albanian: binjak (sq) m
- Arabic: تَوْأَم m (tawʔam)
- Gulf Arabic: توم (tōm), توأم (tawʔam)
- Armenian: երկվորյակ (hy) (erkvoryak)
- Aromanian: dzeamin, biznat, didimarcu
- Assamese: যঁজা (zõza)
- Asturian: ximelu m
- Azerbaijani: əkiz (az)
- Bashkir: игеҙәк (igeźək)
- Basque: biki
- Belarusian: блізню́к m (bliznjúk), блізню́чка f (bliznjúčka), блізні́ца f (blizníca), блізня́ n (bliznjá), блізнё n (bliznjó), блізня́тка n (bliznjátka) (endearing)
- Bengali: যমজ (bn) (jomoj)
- Bhojpuri: जुड़वाँ (juṛᵊvā̃)
- Bikol Central: kambal (bcl)
- Breton: gevell (br)
- Bulgarian: близна́к (bg) m (bliznák), близна́чка f (bliznáčka)
- Burmese: အမြွှာ (my) (a.hmrwa)
- Catalan: bessó (ca) m
- Cebuano: kaluha
- Chamicuro: ma'pwalo
- Chinese:
- Cantonese: 孖生 (maa1 saang1), 雙胞胎 / 双胞胎 (soeng1 baau1 toi1)
- Mandarin: 雙胞胎 / 双胞胎 (zh) (shuāngbāotāi), 雙生子 / 双生子 (zh) (shuāngshēngzǐ)
- Cornish: gevell m, gevelles f
- Crimean Tatar: egiz
- Czech: dvojče (cs) n
- Danish: tvilling (da) c
- Dutch: tweeling (nl) m
- Elfdalian: bilingg m, twilingg m
- Esperanto: ĝemelo (eo), ĝemelino (female)
- Estonian: kaksik
- Faroese: tvíburi
- Finnish: kaksonen (fi)
- French: jumeau (fr) m, jumelle (fr) f
- Friulian: zimul m, gimul m
- Galician: xemelgo (gl) m
- Georgian: ტყუპი (ka) (ṭq̇uṗi)
- German: Zwilling (de) m, Zwillingin f
- Greek: δίδυμος (el) m or f (dídymos)
- Ancient: δίδυμος m (dídumos), δίδυμη f (dídumē)
- Greenlandic: marluliaq
- Haitian Creole: jimo, marasa
- Hebrew: תאום / תְּאוֹם (he) m (teóm), תאומה / תְּאוֹמָה f (teomá)
- Hiligaynon: kapid
- Hindi: जुड़वाँ (hi) m (juṛvā̃), यमज (hi) (yamaj)
- Hungarian: iker (hu), ikertestvér (hu)
- Icelandic: tvíburi (is) m
- Ido: jemelo (io)
- Indonesian: kembar (id)
- Ingrian: kaksikko
- Irish: leathchúpla m
- Italian: gemello (it) m, gemella (it) f
- Japanese: 双子 (ja) (ふたご, futago)
- Kazakh: егіз (egız)
- Khmer: ភ្លោះ (km) (phlŭəh)
- Kituba: dipasa
- Korean: 쌍둥이 (ko) (ssangdung'i), 갈오기 (garogi) (obsolete, dialectal)
- Kyrgyz: эгиз (ky) (egiz)
- Lao: ຝາແຝດ (fā fǣt), ລູກແຝດ (lūk fǣt), ແຝດ (fǣt)
- Latgalian: dveiņs
- Latin: geminus m, gemina f, connascor, connatus m, connata f, gemellus m, gemella f
- Latvian: dvīnis m, dvīne f
- Lingala: lipasa
- Lithuanian: dvynys m
- Lombard: jumell m, gemell m
- Luxembourgish: Zwilling (lb) m
- Macedonian: бли́знак m (blíznak), бли́значка f (blíznačka)
- Malay: kembar (ms)
- Maltese: tewmi m
- Manchu: ᡳᡴᡳᡵᡳ (ikiri)
- Middle Persian: (jamag)
- Mongolian: ихэр (mn) (ixer)
- Nanai: адо (ado)
- Navajo: naakiishchíín
- Northern Sami: jumešbealli, jumeš
- Norwegian:
- Bokmål: tvilling (no) m
- Nynorsk: tvilling m
- Occitan: besson (oc) m
- Old Church Slavonic:
- Cyrillic: близньць m (bliznĭcĭ)
- Old Czech: blížně n
- Old English: ġetwisa m, ġetwin m
- Oromo: lakkuu
- Ottoman Turkish: ایكیز (ikiz)
- Persian: دوقلو (fa) (doqolu)
- Polish: bliźniak (pl) m, bliźniaczka (pl) f
- Portuguese: gémeo (pt) m (Portugal), gémea f (Portugal), gêmeo (pt) m (Brazil), gêmea f (Brazil)
- Punjabi: (juvvu)
- Romanian: geamăn (ro) m, geamănă f
- Romansch: schumellin m, schumellina f
- Russian: близне́ц (ru) m (bliznéc), близня́шка (ru) m or f (bliznjáška) (colloquial), дво́йня (ru) f (dvójnja) (two twins), близня́та (ru) n pl (bliznjáta) (collective, colloquial)
- Sambali: kambal
- Sardinian: copiolu
- Scottish Gaelic: leth-aon m
- Serbo-Croatian:
- Cyrillic: близа́нац m
- Roman: blizánac (sh) m
- Sinhalese: නිමුන් (nimun)
- Slovak: dvojča n
- Slovene: dvójček (sl) m, dvójčica f
- Somali: mataan
- Sorbian:
- Lower Sorbian: dwójnik m, dwójnica f
- Upper Sorbian: dwójnik m
- Southern Altai: эгис (egis)
- Spanish: gemelo (es) m (identical), gemela (es) f (identical), mellizo m (dizygotic), melliza (es) f (dizygotic), chachagua m (Nicaragua), chacho (es) m (El Salvador, Honduras), cuache m (Guatemala, dizygotic sibling), cuape m (Nicaragua), cuate (es) m (Mexico, dizygotic sibling), cuata f (Mexico, dizygotic sibling), guacho (es) m (Honduras), guape m (Costa Rica), guápil m (Costa Rica), guares (es) m pl (Puerto Rico), jimagua m (Cuba), mello (es) m (Colombian Caribbean Coast, dizygotic sibling), morocho (es) m (Venezuela, dizygotic sibling)
- Sranan Tongo: o-o
- Swahili: pacha (sw)
- Swedish: tvilling (sv) c
- Tagalog: kambal
- Tajik: ҳамзод (hamzod)
- Tarifit: ašniw m, akniw m
- Tatar: игезәк (tt) (igezäk), игез (igez)
- Thai: แฝด (th) (fɛ̀ɛt), ฝาแฝด (th) (fǎa-fɛ̀ɛt), ลูกแฝด (lûuk-fɛ̀ɛt)
- Tok Pisin: sangsangana pl
- Turkish: ikiz (tr)
- Turkmen: ekiz
- Ukrainian: близню́к (uk) m (blyznjúk), близню́чка (uk) f (blyznjúčka), близня́ f (blyznjá) (two twins, collective), близня́та (uk) n pl (blyznjáta) (collective)
- Urdu: جڑواں m (juṛvā̃), یمج m (yamaj)
- Uyghur: قوشكېزەك (qoshkëzek)
- Uzbek: egizak (uz)
- Venetan: zemèl m, xemèło m
- Vietnamese: trẻ sinh đôi
- Volapük: telädan (vo) m or f, hitelädan m, jitelädan f
- Welsh: gefell (cy) m, gefeilles (cy) f, gefeilliaid m pl
- West Frisian: twilling (collective)
- Yakut: игирэ (igire)
- Yiddish: צווילינג m (tsviling)
- Yoruba: ibejí
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