阿默湖（德语：Ammersee，英语：Lake Ammer）是德国的湖泊，地处巴伐利亚州。长16.2公里、宽5公里，面积46.6平方公里，是该国第六大湖泊，集水区面积993平方公里，海拔高度520米，平均水深37.8米，最大水深81米。

Ammersee (English: Lake Ammer) is a Zungenbecken lake in Upper Bavaria, Germany, southwest of Munich between the towns of Herrsching and Dießen am Ammersee. With a surface area of approximately 47 square kilometres (18 sq mi), it is the sixth largest lake in Germany. The lake is at an elevation of 533 metres (1,749 ft), and has a maximum depth of 81 metres (266 ft). Like other Bavarian lakes, Ammersee developed as a result of the ice age glaciers melting. Ammersee is fed by the River Ammer, which flows as the Amper out of the lake. Like neighbouring Lake Starnberg, which is similar in size and shape, it is a popular location for watersports.