Lake Managua (also known as Lake Xolotlán) is a lake in Nicaragua. It is appoximately 40 miles long and 15 miles wide.

The lake has been severely polluted, in part by Kodak dumping mercury into the lake in the 1950s. Some of the people of Managua still live along its banks and eat the fish. They know it is horribly polluted but they have no other source of food due to the oppresive poverty they live in.

It rose 10 feet in 5 days during Hurricane Mitch in 1998, destroying the homes of many who lived on its edge.

It is also joined by a river to another lake, Lake Nicaragua; however, due to the extreme pollution, the bull sharks of lake Nicaragua can't join lake Managua. However, this lake has still mysteries.