Manimuthar is the name of four different rivers in Tamil Nadu, India:
Manimuthar River (tributary of Thamirabarani) Manimuthar River (tributary of Pambar), a river of Tamil Nadu Manimuthar River (tributary of Vellar), a river of Tamil Nadu Thirumanimutharu River (tributary of Kaveri)
See also Manimuktha River, a tributary of the Vellar River in Tamil Nadu