The Mpassa River is a tributary of the Ogooue River.
It flows in Gabon, and passes through Franceville. Its main tributary is the Ndjoumou River. The Mpassa River rises in the Bateke Plateau near the border with the Republic of the Congo.
Coordinates: 1°36′52″S 13°33′11″E / 1.61444°S 13.55306°E