- Afrikaans: Ioniese See
- Albanian: Deti Jon
- Arabic: اَلْبَحْر اَلْأَيْوُنِيّ m (al-baḥr al-ʔaywuniyy)
- Armenian: Հոնիական ծով (Honiakan cov)
- Azerbaijani: İoni dənizi
- Basque: Jonikoa, Itsaso Jonikoa
- Belarusian: Іані́чнае мо́ра n (Ianíčnaje móra)
- Bengali: আয়োনীয় সাগর (aẏōniẏo śagor)
- Breton: Mor Ionian m
- Bulgarian: Йонийско море n (Jonijsko more)
- Burmese: အိုင်ယွန်းနီးယန်းပင်လယ် (uing-ywan:ni:yan:panglai)
- Catalan: mar Jònica f
- Chinese:
- Mandarin: 愛奧尼亞海 / 爱奥尼亚海 (zh) (Ài'àoníyà hǎi), 伊奧尼亞海 / 伊奥尼亚海 (Yīàoníyàhǎi)
- Czech: Jónské moře (cs) n
- Danish: Ioniske Hav n
- Dutch: Ionische Zee (nl)
- Esperanto: Ionia Maro
- Estonian: Joonia meri
- Farefare: Yoni-ateko
- Finnish: Joonianmeri (fi)
- French: mer Ionienne (fr) f
- Galician: Mar Xónico m
- Georgian: იონიის ზღვა (ioniis zɣva)
- German: Ionisches Meer (de) n
- Greek: Ιόνιο πέλαγος (el) n (Iónio pélagos)
- Hebrew: הים היוני m (ha-yam ha-yoni)
- Hindi: आयोनियन सागर (āyoniyan sāgar)
- Hungarian: Jón-tenger (hu)
- Icelandic: Jónahaf n
- Indonesian: Laut Ionia
- Irish: Muir Iónach f
- Italian: Mar Ionio m
- Japanese: イオニア海 (Ionia-kai)
- Kannada: ಐಯೊನಿಯನ್ ಸಮುದ್ರ (aiyoniyan samudra)
- Kazakh: Ион теңізі (İon teñızı)
- Khmer: សមុទ្រអ៊ីអូនីអាន់ (sɑɑmutrɔɔʼiiʼouniiʼan)
- Korean: 이오니아해 (ioniahae)
- Kyrgyz: Иония деңизи (İoniya deŋizi)
- Lao: ທະເລໄອໂອນຽນ (tha lē ʼai ʼō nīan)
- Latin: Mare Ionium n
- Latvian: Jonijas jūra f
- Lithuanian: Jonijos jūra f
- Macedonian: Јонско Море n (Jonsko More)
- Malay: Laut Ionia
- Malayalam: അയോണിയൻ കടൽ (ayōṇiyaṉ kaṭal)
- Maltese: il-Baħar Jonju
- Marathi: आयोनियन समुद्र (āyoniyan samudra)
- Norman: Mé Ionienne f
- Norwegian:
- Bokmål: Det joniske hav n
- Nynorsk: Det joniske havet n
- Persian: دریای یونان (daryâ-ye yunân)
- Polish: Morze Jońskie (pl) n
- Portuguese: Mar Jônico m
- Punjabi: ਇਓਨੀਓ ਸਮੁੰਦਰ (ionīo samundar)
- Romanian: Marea Ionică f
- Russian: Иони́ческое мо́ре (ru) n (Ioníčeskoje móre)
- Serbo-Croatian:
- Cyrillic: Јонско море n
- Roman: Jonsko more n
- Sicilian: Mari Joniu m
- Slovak: Iónske more n
- Slovene: Jonsko morje
- Spanish: Mar Jónico m
- Swedish: Joniska havet (sv) n
- Tamil: அயோனியன் கடல் (ayōṉiyaṉ kaṭal)
- Telugu: అయోనియన్ సముద్రం (ayōniyan samudraṁ)
- Thai: ทะเลไอโอเนียน (tá-lee ai-oo-niian)
- Turkish: İyon Denizi (tr)
- Turkmen: İyonya Denizi
- Ukrainian: Іоні́чне море n (Ioníčne more)
- Uzbek: Ioni dengizi
- Vietnamese: Biển Ionia
- Welsh: Môr Ionia m
- West Frisian: Ioanyske See
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