Lékoumou (can also be written as Lekumu) is a department of the Republic of the Congo in the southern part of the country.

It borders the departments of Bouenza, Niari, Plateaux, Pool, and the nation of Gabon.

Lékoumou Department is divided into five districts: Subsistence farming, carried out by small producers (cassava, peanuts, tarots, plantain, squash, sorrel, ginger, artisanal palm oil), and arboriculture (safoutiers, mango trees, bananas) are the main agricultural activities.

The region offers tourist wealth oriented towards the discovery of the country, the forest, the villages and their products.

A liana bridge, located towards Bambama, near the village of Simonbondo, on the Gabonese border, is famous for the choice of natural materials and their assembly, making it possible to cross 74 m. without intermediate support0°52′00″S 14°49′00″E / 0.866667°S 14.8167°E / -0.866667; 14.8167