Larreynaga (Spanish pronunciation: [laˈrejnaɣa]) is the second largest municipality in the León Department of Nicaragua.

[2] The estimated population of the municipality is 33,117 but it is steadily growing at a rate of 2.22% yearly.

[3] The municipality of Larreynaga was founded by Colonel Manuel Ignacio Pereira Quintana on August 11, 1944.

[3][4] The municipality of Larreynaga is home to the Cerro Negro volcano, just 10 km from the city of Malpaisillo.

In recent years, the Cerro Negro volcano has been a popular destination for sandboarding.