比尔湖 （德语: Bielersee；法语: Lac de Bienne）是瑞士西部的一个湖泊。比尔湖与穆尔滕湖和纳沙泰尔湖并为汝拉地区的三个大湖。面积39.3平方公里，最深处74米。湖水平均停留时间为58日。湖面海拔高度429米。比尔湖周边的主要城市有比尔、拉纳夫维尔等。

Lake Biel or Lake Bienne (German: Bielersee, French: Lac de Bienne) is a lake in the west of Switzerland. Together with Lake Morat and Lake Neuchâtel, it is one of the three large lakes in the Jura region of Switzerland. It lies approximately at 47°5′N 7°10′E / 47.083°N 7.167°E / 47.083; 7.167 (Lake Biel), at the language boundary between German & French speaking areas.