- Afrikaans: See van Japan
- Albanian: Deti i Japonisë m
- Arabic: بَحْر اَلْيَابَان m (baḥr al-yābān)
- Armenian: Ճապոնական ծով (Čaponakan cov)
- Assamese: জাপান সাগৰ (zapan xagor)
- Asturian: Mar de Xapón m
- Azerbaijani: Yapon dənizi (az)
- Bashkir: Япон диңгеҙе (Yapon diñgeðe)
- Basque: Japoniako itsasoa
- Belarusian: Япо́нскае мо́ра n (Japónskaje móra)
- Bengali: জাপান সাগর (japan śagôr)
- Breton: Mor Japan m
- Bulgarian: Япо́нско мо́ре n (Japónsko móre)
- Catalan: mar del Japó m
- Chinese:
- Cantonese: 日本海 (jat6 bun2 hoi2)
- Mandarin: 日本海 (zh) (Rìběn hǎi)
- Min Dong: 日本海 (Nĭk-buōng-hāi)
- Min Nan: 日本海 (Ji̍t-pún-hái)
- Wu: 日本海 (zeq pen he)
- Chuvash: Япон тинӗсӗ (Japon tinĕsĕ)
- Czech: Japonské moře (cs) n
- Danish: Japanske Hav n
- Dutch: Japanse Zee f
- Eastern Mari: Япо́н теҥыз (Japón teŋəz)
- Esperanto: Japana maro
- Estonian: Jaapani meri
- Finnish: Japaninmeri
- 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)
- Kazakh: Жапон теңізі (Japon teñizi)
- Khmer: សមុទ្រជប៉ុន (sɑɑmutrɔɔcpon)
- Korean: (seldom used by Koreans) 일본해 (Ilbonhae, literally “Sea of Japan”) (日本海), (South Korean) 동해 (Donghae, literally “East Sea”) (東海 (ko)), (North Korean) 조선동해 (Joseondonghae, literally “Eastern Sea of Korea”) (朝鮮東海)
- Kurdish: Deryaya Japanî, Deryaya Japanê
- Kurmanji: Derya Japon
- Lao: ທະເລຍີ່ປຸ່ນ (lo) (tha lē nyī pun)
- Latin: Mare Iaponicum n
- Latvian: Japāņu jūra f
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- Limburgish: Japanszieë (li) f
- Lithuanian: Japonijos jūra f
- Livvi: Japounienmeri
- Low German:
- German Low German: Japaansche See n
- Macedonian: Јапонско Море n (Japonsko More)
- Malay: Laut Jepun
- Maltese: Baħar tal-Ġappun m
- Marathi: जपानचा समुद्र m (japāncā samudra)
- Mingrelian: იაპონიაშ ზუღა (iaṗoniaš zuɣa)
- Mongolian: Япон тэнгис (Japon tengis)
- Norwegian: Japanhavet n
- Occitan: mar de Japon f
- 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
- Serbo-Croatian:
- Cyrillic: Јапанско мо̑ре n
- Roman: Japansko mȏre n
- Slovak: Japonské more n
- Slovene: Japonsko morje n
- 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 (Bahri Jopon)
- Tamil: யப்பான் கடல் (yappāṉ kaṭal)
- Tatar: Япо́н диңгезе́ (Yapón diñgezé)
- Telugu: జపాన్ సముద్రం (japān samudraṃ)
- Thai: ทะเลญี่ปุ่น (tá-lay yêe-bpùn)
- Turkish: Japon Denizi
- Turkmen: Ýapon deňzi
- Ukrainian: Япо́нське мо́ре 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
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