Mamandur is a village in Tiruvanamalai district of Tamil Nadu, India. It is located on the Kanchipuram - Vandavasi road, near Dusi. It is known for the 7th-century rock-cut cave temple, which is one of the monuments of national importance as declared by the Archaeological Survey of India. Inscriptions in the rock-cut temples, attribute the temples to 7th-century CE Pallava king, Mahendravarman I. Narsimha is the principal deity of Cave I, while the Cave II, in the complex, is known from later inscriptions as the Saiva Rudravalisvaram Cave.