Kwamishinan Muhalli na Ontario ( ECO ; French: Commissaire à l’environnement de l’Ontario ) jami'in da ba na bangaranci ba ne na Majalisar Dokoki ta Ontario wanda aka zarge shi da tabbatar da Dokar Haƙƙin Muhalli ta lardin (EBR). Kwamishinan bai kai rahoto ga wata ma’aikatar ba, sai dai ita kanta majalisar, kuma an zabo shi ne ta hanyar shawarar kwamitin jam’iyyar da shugaban majalisar ya jagoranta. Daga nan ne aka nada shi ɗan takarar ta hanyar ƙuri'ar gamayya ta Majalisar Dokoki ta Ontario. Ofishin Kwamishinan Muhalli na Ontario ya ƙunshi Kwamishinan da ma’aikata 24, waɗanda suka tallafa wa Kwamishinan wajen sa ido kan yadda ake gudanar da ayyukan muhalli EBR da kuma ba da rahoto ga Majalisar. Gwamnatin lardin Premier Doug Ford ta soke ofishin a cikin shekarata 2019, tare da alhakin aiwatarwa da gudanar da EBR zuwa ga Babban Auditor na Ontario. Manufar EBR ita ce a bai wa 'yan Ontario haƙƙoƙin shiga cikin yanke shawara na muhalli, da kuma ɗaukar ma'aikatu alhakin yanke shawararsu yayin da suke shafar muhalli.