- Afrikaans: Ontariomeer
- Albanian: Liqeni Ontario
- Arabic: بُحَيْرَة أُونْتَارْيُو f (buḥayra(t) ʔūntāryū)
- Armenian: Օնտարիո լիճ (Ōntario lič)
- Azerbaijani: Ontario gölü
- Belarusian: Антарыа n (Antarya)
- Bengali: অন্টারিও হ্রদ (onṭariō hrod)
- Breton: Lenn Ontario m
- Bulgarian: Онтарио n (Ontario)
- Burmese: အွန်တေးရီးယိုးကန် (wante:ri:yui:kan)
- Catalan: llac Ontàrio m
- Chinese:
- Cantonese: 安大略湖 (on1 daai6 loek6 wu4)
- Mandarin: 安大略湖 (zh) (Āndàlüè Hú)
- Czech: Ontarijské jezero n, Ontario (cs) n
- Danish: Lake Ontario c
- Dutch: Ontariomeer n
- Esperanto: Ontario
- Estonian: Ontario järv
- Finnish: Ontariojärvi
- French: lac Ontario m
- Galician: Lago Ontario m
- Georgian: ონტარიოს ტბა (onṭarios ṭba)
- German: Ontariosee (de) m
- Greek: Λίμνη Οντάριο f (Límni Ontário)
- Hebrew: ימת אונטריו f (yamát ontário)
- Hindi: ओण्टारियो झील (oṇṭāriyo jhīl)
- Hungarian: Ontario-tó (hu)
- Indonesian: Danau Ontario
- Irish: Loch Ontario m
- Italian: lago Ontario m
- Japanese: オンタリオ湖 (Ontario-ko)
- Kannada: ಆಂಟೇರಿಯೊ ಸರೋವರ (āṇṭēriyo sarōvara)
- Kazakh: Онтарио (Ontario)
- Korean: 온타리오호 (Ontarioho)
- Kyrgyz: Онтарио (Ontario)
- Lao: ທະເລສາບອອນແທຣິໂອ (tha lē sāp ʼǭn thǣ ri ʼō)
- Latvian: Ontārio ezers m
- Lithuanian: Ontarijo ežeras m
- Macedonian: Онтарио n (Ontario)
- Malay: Tasik Ontario
- Malayalam: ഒണ്ടാറിയോ തടാകം (oṇṭāṟiyō taṭākaṁ)
- Marathi: ऑन्टारियो सरोवर (ŏnṭāriyo sarovar)
- Mohawk: Oniatarí:io, Kaniatarí:io
- Norwegian:
- Bokmål: Ontariosjøen m
- Nynorsk: Ontariosjøen m
- Ottawa: Gchi-zaaghigan, Niigaanii-gchigami
- Persian: دریاچه انتاریو (daryâče-ye ontâriô)
- Polish: Ontario (pl) n, Jezioro Ontario n
- Portuguese: Lago Ontário m
- Punjabi: ਓਂਟਾਰੀਓ ਝੀਲ (oṇṭārīo jhīl)
- Romanian: Lacul Ontario n
- Russian: Онта́рио (ru) n (Ontário)
- Serbo-Croatian:
- Cyrillic: Језеро Онтарио n
- Roman: Jezero Ontario n
- Slovak: Ontárijské jazero n, Ontário n
- Slovene: Ontarijsko jezero n
- Spanish: Lago Ontario m
- Swedish: Ontariosjön c
- Tamil: ஒண்டாரியோ ஏரி (oṇṭāriyō ēri)
- Telugu: ఒంటారియో సరస్సు (te) (oṇṭāriyō sarassu)
- Thai: ทะเลสาบออนแทรีโอ (tá-lee-sàap ontaereeoh)
- Turkish: Ontario Gölü
- Ukrainian: Онта́ріо n (Ontário)
- Uzbek: Ontario
- Vietnamese: hồ Ontario
- Welsh: Llyn Ontario m
- Wendat: Ontarïio’
- West Frisian: Ontariomar n
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