安大略湖（Lake Ontario）北邻加拿大安大略省，南毗尼亚加拉半岛和美国纽约州，是北美洲五大湖之一。
安大略来自易洛魁语Skanadario，意思是“美丽之湖”或“闪光之湖”。加拿大的安大略省因此湖得名。
安大略湖是五大湖中面积最小的（19,009平方公里），但是蓄水量超过伊利湖（1,639立方公里），是世界第十四大湖，湖岸线长1,162公里。最深处有244米。最大的流入河流是尼亚加拉河，最大的流出河流是圣劳伦斯河。
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