The Kailasanathar temple, also referred to as the Kailasanatha temple, is a Pallava-era historic Hindu temple in Kanchipuram, Tamil Nadu, India. Dedicated to Shiva, it is one of the oldest surviving monuments in Kanchipuram. It reflects a Dravidian architecture and was built about 700 CE by a Rajasimha with additions by Mahendra III. A square-plan temple, it has a mukha-mandapa, a maha-mandapa and a primary garbha-griya topped with a four-storey vimana. The main sanctum is surrounded by nine shrines, seven outside and two inside flanking the entrance of the sanctum, all with forms of Shiva. The outer walls of the temple's prakara is also surrounded by cells.
The Kailasanathar temple is notable for its intricately carved galaxy of Hindu art in the late 7th- and early 8th–century Tamil tradition. These largely relate to Shaivism, yet also include significant number of themes from Vaishnavism, Shaktism and Vedic deities. The temple is also notable for one of the early and best specimens of Hindu mural art in Tamil Nadu. This is found in the inner walls of the courtyard cells.