Lesaka is a town and municipality in the province and autonomous community of Navarre, in northern Spain. It lies in the merindad of Iruña and in the region of Bortziriak, about 75 kilometres from Pamplona, the capital of Navarre.
The municipality had a population of 2,742 inhabitants in 2014. It is one of the towns that make up the Bortziriak area, a district in the north-western part of Navarre.