Vandavasi (Tamil: வந்தவாசி) or Wandiwash is a city and a municipality in Tiruvanamalai district in the Indian state of Tamil Nadu.

Vandavasi was the scene of a decisive battle in the 18th-century war between France and the United Kingdom for the control of South Asia. The Battle of Wandiwash was a watershed in Indian history as it cemented British supremacy in South Asia. On January 22, 1760, a British force led by Eyre Coote defeated a French force led by General Lally.

Vandavasi is located at 12°30′N 79°37′E / 12.5°N 79.62°E / 12.5; 79.62. It lies 110 kilometres South-West of Chennai City, South of famous temple city Kanchipuram and 80 km north-east of Thiruvannamalai. The town is well connected with Chennai by road. It has an average elevation of 74 metres (242 feet). Vandavasi climatic condition is similar to that of Chennai, lying on the thermal equator and close to the coast, most part of the year climate is hot and humid. Birudhur village president R.Selvakumar it is in vandavasi taluk