Ranjankudi Fort is a 17th-century fortress. The fort is located 22 km north of Perambalur in National Highway 45 in the South Indian state of Tamil Nadu. It is located 253 km away from the state capital Chennai and 70 km from Trichy. The fort is oblong in shape with semicircular bastions, a moat encircling it and three fortifications at different levels, built with cut stone blocks. The fort has a palace, residence buildings, underground chamber and an underground passage that links Pettai with Kottai Medu . The fort, in modern times, is maintained and administered by the Archaeological Survey of India.The fort is one of the prominent tourist destinations in Perambalur.