Mannargudi (Tamil pronunciation: [mannaːrgɯɖi]) is a town in Thiruvarur district in the Indian state of Tamil Nadu. It is the headquarters of the Mannargudi taluk. The town is located at a distance of 28 km (17 mi) from the district headquarters Thiruvarur, 36 km from Kumbakonam, 40 km from Thanjavur and 310 km (190 mi) from the state capital Chennai. Mannargudi is known for the Rajagopalaswamy temple, a prominent Vaishnavite shrine.
Mannargudi was founded as an agraharam village by the Medieval Cholas during the 7th century A.D. The town was subsequently ruled by various dynasties including the Chola king Rajadhiraja Chola (1018–1054 CE), Vijayanagar Empire, Delhi Sultanate, Thanjavur Nayaks, Thanjavur Marathas and the British Empire. Mannargudi was a part of the erstwhile Tanjore district until India's independence in 1947 and Thanjavur district until 1991. It subsequently became a part of the newly formed Tiruvarur district.