- Afrikaans: See van Japan
- Albanian: Deti i Japonisë m
- Amharic: የጃፓን ባሕር (yäǧapan baḥr)
- Arabic: بَحْر اَلْيَابَان m (baḥr al-yābān), بحر الشرق m (baḥr al-šarq, literally “East Sea”)
- Armenian: Ճապոնական ծով (Čaponakan cov)
- Assamese: জাপান সাগৰ (zapan xagor)
- Asturian: Mar de Xapón m
- Azerbaijani: Yapon dənizi (az)
- Bashkir: Япон диңгеҙе (Yapon diñgeźe)
- Basque: Japoniako itsasoa
- Belarusian: Япо́нскае мо́ра n (Japónskaje móra)
- Bengali: জাপান সাগর (japan śagor)
- Breton: Mor Japan m
- Bulgarian: Япо́нско мо́ре n (Japónsko móre)
- Burmese: ဂျပန်ပင်လယ် (gya.panpanglai)
- Catalan: mar del Japó m
- Chinese:
- Cantonese: 日本海 (jat6 bun2 hoi2)
- Eastern Min: 日本海 (Nĭk-buōng-hāi)
- Hokkien: 日本海 (Ji̍t-pún-hái)
- Mandarin: 日本海 (zh) (Rìběn hǎi)
- Wu: 日本海
- Chuvash: Япон тинӗсӗ (Jap̬on t̬inĕs̬ĕ)
- Corsican: Mari di u Giappone m, Mar di u Giappone m, Mari di u Ghjappone m, Mar di u Ghjappone m
- Czech: Japonské moře (cs) n
- Danish: Japanske Hav n
- Dutch: Japanse Zee f
- Eastern Mari: Япо́н теҥыз (JApón teŋyz)
- Esperanto: Japana Maro
- Estonian: Jaapani meri
- Finnish: Japaninmeri (fi)
- French: mer du Japon (fr) f
- Galician: mar do Xapón m
- Georgian: იაპონიის ზღვა (iaṗoniis zɣva)
- German: Japanisches Meer (de) n
- Greek: Ιαπωνική Θάλασσα f (Iaponikí Thálassa), Θάλασσα της Ιαπωνίας f (Thálassa tis Iaponías)
- Guaraní: Para Hapõ
- Hebrew: יַם יַפָּן m (yam yapán)
- Hindi: जापान सागर m (jāpān sāgar)
- Hungarian: Japán-tenger (hu)
- Icelandic: Japanshaf n
- Ilocano: Baybay ti Hapon
- Indonesian: Laut Jepang
- Irish: Muir na Seapáine f
- Italian: Mar del Giappone m
- Japanese: 日本海 (ja) (にほんかい, Nihonkai)
- Kannada: ಜಪಾನ್ ಸಮುದ್ರ (japān samudra)
- Kazakh: Жапон теңізі (Japon teñızı)
- Khmer: សមុទ្រជប៉ុន (sɑɑmutrɔɔcpon)
- Korean: (seldom used by Koreans) 일본해(日本海) (ko) (Ilbonhae, literally “Sea of Japan”), (South Korean) 동해(東海) (ko) (Donghae, literally “East Sea”), (North Korean) 조선동해(朝鮮東海) (ko) (Joseondonghae, literally “Eastern Sea of Korea”)
- Kurdish:
- Northern Kurdish: Deryaya Japanî, Deryaya Japanê, Derya Japon
- Kyrgyz: Жапон деңизи (Japon deŋizi)
- Lao: ທະເລຍີ່ປຸ່ນ (tha lē nyī pun)
- Latin: Mare Iaponicum n, Mare Iaponiae n
- Latvian: Japāņu jūra f
- Limburgish: Japanszieë f
- Lithuanian: Japonijos jūra f
- Livvi: Japounienmeri
- Macedonian: Јапонско Море n (Japonsko More)
- Malay: Laut Jepun
- Malayalam: ജപ്പാൻ കടൽ (jappāṉ kaṭal)
- Maltese: Baħar tal-Ġappun m
- Manchu: ᡩᡝᡵᡤᡳ
ᠮᡝᡩᡝᡵᡳ (dergi mederi)
- Marathi: जपानचा समुद्र m (japāncā samudra)
- Mingrelian: იაპონიაშ ზუღა (iaṗoniaš zuɣa)
- Mongolian: Япон тэнгис (Japon tengis)
- Norwegian:
- Bokmål: Japanhavet n
- Nynorsk: Japanhavet n
- Occitan: mar de Japon m, mar del Japon m
- Persian: دریای ژاپن (daryâ-ye žâpon)
- Polish: Morze Japońskie (pl) n
- Portuguese: Mar do Japão m
- Punjabi: ਜਪਾਨ ਸਮੁੰਦਰ m (japān samundar)
- Quechua: Nihun hatun qucha
- Romanian: Marea Japoniei f
- Russian: Япо́нское мо́ре (ru) n (Japónskoje móre)
- Samogitian: Japuonėjės jūra f
- Scots: Sea o Japan, See o Japan
- Serbo-Croatian:
- Cyrillic: Јапанско мо̑ре n
- Roman: Japansko mȏre n
- Slovak: Japonské more n
- Slovene: Japonsko morje n
- Somali: Badda Jabaan
- Sorbian:
- Lower Sorbian: Japańske mórjo n
- Upper Sorbian: Japanske morjo n
- Spanish: mar del Japón m
- Sundanese: ᮜᮅᮒ᮪ ᮏᮨᮕᮀ (laut jepang)
- Swahili: Bahari ya Japani
- Swedish: Japanska havet n
- Tagalog: Dagat ng Hapon, Dagat Hapon
- Tajik: Баҳри Ҷопон (Bahr-i Jopon)
- Tamil: யப்பான் கடல் (yappāṉ kaṭal)
- Tatar: Япо́н диңгезе́ (Yapón diñgezé)
- Telugu: జపాన్ సముద్రం (japān samudraṁ)
- Thai: ทะเลญี่ปุ่น (tá-lay yêe-bpùn)
- Turkish: Japon Denizi
- Turkmen: Ýapon deňzi
- Ukrainian: Япо́нське мо́ре (uk) n (Japónsʹke móre)
- Urdu: بحیرہ جاپان m
- Uzbek: Yapon dengizi
- Veps: Japonijan meri
- Vietnamese: biển Nhật Bản
- Waray-Waray: Dagat Hapon
- Welsh: Môr Japan m
- West Frisian: Japanske See c
- Western Panjabi: جپانی سمندر (jpānī smndr)
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