五大湖（英语：Great Lakes）是位于加拿大与美国交界处的5个大型淡水湖泊，按面积从大到小分别为：苏必利尔湖（Lake Superior）、休伦湖（Lake Huron）、密歇根湖（Lake Michigan）、伊利湖（Lake Erie）和安大略湖（Lake Ontario）。除密歇根湖全属于美国之外，其它4湖为加拿大和美国共有。

这5个湖泊所组成的五大湖是世界上面积最大的淡水水域，包括了世界地表淡水的21% 。五大湖的总面积为94,250平方英里（244,106平方公里），总水量为5,439立方英里（22,671立方公里）。五大湖有时也被有些美国人称作北海岸或第三海岸。 五大湖湖岸也被认为是北美第四长岸线，总长大约为17,000公里（10,563英里），粗略相当于地球赤道一半的长度。

The Great Lakes (also called the Laurentian Great Lakes, or the Great Lakes of North America) are a series of interconnected freshwater lakes located in northeastern North America, on the Canada–United States border, which connect to the Atlantic Ocean through the Saint Lawrence River. Consisting of Lakes Superior, Michigan, Huron (or Michigan–Huron), Erie, and Ontario, they form the largest group of freshwater lakes on Earth, containing 21% of the world's surface fresh water by volume. The total surface is 94,250 square miles (244,106 km), and the total volume (measured at the low water datum) is 5,439 cubic miles (22,671 km). Due to their sea-like characteristics (rolling waves, sustained winds, strong currents, great depths, and distant horizons) the five Great Lakes have also long been referred to as inland seas. Lake Superior is the second largest lake in the world by area, and Lake Michigan is the largest lake that is entirely within one country. The southern half of the Great Lakes is surrounded by the Great Lakes Megalopolis.