- Abkhaz: аԥслы (apslə)
- Afrikaans: otter
- Ainu: エサマン (esáman)
- Albanian: lundërz (sq) f, vidër (sq) f, lundër (sq) f
- Algonquin: nigig
- Arabic: قُضَاعَة f (quḍāʕa), ثَعْلَب الْمَاء m (ṯaʕlab al-māʔ)
- Aragonese: loira f, luria f, nuria f
- Armenian: ջրասամույր (hy) (ǰrasamuyr)
- Old Armenian: շնջրի (šnǰri)
- Aromanian: vidrã f
- Assamese: উদ (ud)
- Asturian: llóndriga (ast) f, llóndrigu (ast) m
- Azerbaijani: çay samuru
- Bashkir: ҡама (qama), ҡамсат (qamsat)
- Basque: igaraba (eu), urtxakur (eu)
- Bau Bidayuh: biron
- Belarusian: вы́дра f (výdra)
- Bengali: ভোঁদড় (bn) (bhō̃doṛ)
- Breton: dourgi (br) m, ki-dour (br) m
- Bulgarian: ви́дра (bg) f (vídra)
- Burmese: ဖျံ (my) (hpyam)
- Catalan: llúdria (ca) f, llúdriga f
- Central Melanau: dengen
- Central Nahuatl: ahuitzotl
- Chepang: तीःचोरो
- Cherokee: ᏥᏯ (tsiya)
- Cheyenne: náa'e
- Chinese:
- Mandarin: 水獺/水獭 (zh) (shuǐtǎ)
- Chipewyan: ną́bį
- Chukchi: кыквэтвун (kykvėtvun), нэннэт (nėnnėt)
- Chuvash: ӑтӑр (ăt̬ăr)
- Classical Nahuatl: āhuitzōtl
- Coptic: ⲟⲩϩⲟⲣ ⲙⲱⲟⲩ (ouhor mōou)
- Czech: vydra (cs) f
- Danish: odder (da) c
- Dutch: otter (nl) m
- Eastern Khanty: вӑнтәр (wăntər)
- Erzya: пачалапа (pačalapa)
- Esperanto: lutro
- Estonian: saarmas (et)
- Faroese: otur m
- Finnish: saukko (fi)
- French: loutre (fr) f
- Friulian: lodre f
- Galician: lontra (gl) f, londra f, ludra f, lóndrega f
- Georgian: წავი (ka) (c̣avi)
- German: Otter (de) m
- Greek: βίδρα (el) f (vídra)
- Ancient: ἔνυδρις f (énudris)
- Halkomelem: sq'á:tl'
- Hebrew: לוּטְרָה (he) f (lútra), כֶּלֶב נָהָר m (kélev nahar)
- Hindi: ऊदबिलाव (hi) m (ūdbilāv), ऊद (hi) m (ūd)
- Hungarian: vidra (hu)
- Icelandic: otur m
- Ido: lutro (io)
- Indonesian: berang-berang (id)
- Irish: dobharchú (ga) m, madra uisce (ga) m, dobhrán (ga) m, cú dobhráin (ga) m
- Old Irish: doburchú f
- Italian: lontra (it) f
- Japanese: (freshwater) 獺 (ja) (かわうそ, kawauso), 川獺 (ja) (かわうそ, kawauso), カワウソ (ja) (kawauso), (marine) 海獺 (ja) (らっこ, rakko), ラッコ (ja) (rakko)
- Jingpho: shäram
- Kazakh: кәмшат (kämşat), қамшат (qamşat)
- Khmer: ភេ (km) (phei)
- Komi-Zyrian: вурд (vurd)
- Korean: 수달 (ko) (sudal)
- Kyrgyz: кундуз (ky) (kunduz)
- Ladin: lontra ?
- Ladino: lontra
- Lao: ນາກ (nāk)
- Latgalian: iudrys m
- Latin: lutra f
- Latvian: ūdrs m
- Laz: წვინარი (ǯvinari)
- Lithuanian: ūdra (lt) f
- Low German: Otter m
- Lun Bawang: dengen
- Macedonian: видра f (vidra)
- Malay: anjing air, berang-berang, memerang
- Jawi: انجيڠ اءير, برڠ٢
- Malayalam: നീർനായ (nīṟnāya)
- Maltese: lontra f
- Manchu: ᡥᠠᡳᠯᡠᠨ (hailun)
- Manx: dooarchoo m, moddey ushtey (gv) m
- Maori: ōtā
- Marathi: पाणमांजर ? (pāṇmāñjar)
- Mi'kmaq: giwnig anim
- Mingrelian: წვინარი (c̣vinari)
- Mon: ဖေံ
- Mongolian: халиг (xalig), халиу (mn) (xaliu)
- Navajo: tábąąstíín
- Nepali: उद्र (udra), ओत (ot)
- Northern Sami: čeavrris
- Norwegian:
- Bokmål: oter (no) m
- Nynorsk: oter m
- Occitan: loira (oc) f
- Odia: ଓଧ (odha)
- Old East Slavic: вꙑдра f (vydra)
- Old English: otor m
- Ossetian:
- Digor: урдӕ (urdæ)
- Iron: уырд (wyrd)
- Ottoman Turkish: صو سموری (su samuru)
- Persian: سمور آبی (samur-e âbi)
- Pipil: ākuyūt
- Pirahã: pibaóí
- Polish: wydra (pl) f
- Portuguese: lontra (pt) f
- Romanian: lutră (ro) f, vidră (ro) f
- Romansch: ludra f, lutra f
- Russian: вы́дра (ru) f (výdra)
- Sanskrit: उद्र (sa) m (udra)
- Santali: ᱚᱫᱟᱢ (ôdam), ᱩᱫᱟᱢ (udam)
- Saraiki: اُدڑ m (udṛ)
- Sardinian: lontra ?
- Scottish Gaelic: dòbhran m, biast-dubh f, dobhar-chù m, biast-donn f (Islay), madadh-donn m (South Argyll, Arran), cù-donn m (Sutherland)
- Serbo-Croatian:
- Cyrillic: ви̏дра f
- Roman: vȉdra (sh) f
- Sicilian: lutra (scn) f
- Slovak: vydra f
- Slovene: vidra (sl) f
- Sorbian:
- Lower Sorbian: wudra f
- Upper Sorbian: wudra f
- Southern Sami: tjeavra
- Spanish: nutria (es) f, lutria (es) f
- Sranan Tongo: watradagu
- Svan: წიუ̂ე̄რ (c̣iûēr)
- Swahili: ota (sw)
- Swedish: utter (sv) c
- Tagal Murut: tilung
- Tagalog: dungon
- Tajik: самури обӣ (samur-i obi), сагобӣ (sagobi), саги обӣ (sag-i obi)
- Tamil: நீர்நாய் (ta) (nīrnāy)
- Telugu: ఉద్రము (udramu), నీటి కుక్క (nīṭi kukka), నీరుకుక్క (te) (nīrukukka), నీరుపిల్లి (te) (nīrupilli)
- Thai: นาก (th) (nâak)
- Tigrinya: ጣቑስታ (ṭaḳʰusta)
- Turkish: su samuru (tr), lutr (tr)
- Turkmen: gunduz
- Udmurt: вад (vad), вудор (vudor)
- Ukrainian: ви́дра f (výdra)
- Urdu: اودبلاؤ m (ūd-bilā'o)
- Uyghur: قۇندۇز (qunduz), قاما (qama)
- Uzbek: qunduz (uz)
- Venetian: lùdria f, lodra
- Vietnamese: rái cá (vi), rái (vi)
- Volapük: lutar (vo)
- Walloon: lote (wa)
- Welsh: dyfrgi (cy) m, dwrgi m
- West Coast Bajau: dongor, embirud
- West Frisian: fiskotter ?
- Yámana: éepux
- Yiddish: ווידרע f (vidre)
- Zhuang: nag
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