The Municipal District of Big Lakes is a municipal district in north-central Alberta, Canada. It is located in Census Division 17, around the Lesser Slave Lake. Utikuma Lake and Winagami Lake are also located in this municipal district.
In 2006, Big Lakes had a population of 5,805 living in 2,215 dwellings, a 0.7% decrease from 2001. The municipal district has a land area of 13,892.91 km2 (5,364.08 sq mi) and a population density of 0.4 /km2 (1.0 /sq mi). In 2001, the municipal district has a population of 5,845 in 2,183 dwellings, a 0.3% increase from 1996. On a surface of 13,893.10 km² it has a density of 0.4 inhabitants/km².