Loncomilla River (Mapudungun for "Gold of the Chief") is a tributary to the Maule river in Linares Province, Maule Region, Chile. Two rivers join to form the Loncomilla River: the Perquilauquén river and Longaví river.
Coordinates: 35°37′30″S 71°44′37″W / 35.62500°S 71.74373°W