Marundeeswarar Temple (மருந்தீஸ்வரர் கோயில்) (also called Idayatrunathar Temple) is a Hindu temple dedicated to the deity Shiva, located in T. Edaiyar, a village in Viluppuram district in the South Indian state of Tamil Nadu. Shiva is worshipped as Marundeeswarar, and is represented by the lingam. His consort Parvati is depicted as Balambigai. The temple is located on the Southern banks of Thenpennai River on the Thirukoilur - Thiruvennainallur road. The presiding deity is revered in the 7th century Tamil Saiva canonical work, the Tevaram, written by Tamil saint poets known as the nayanmars and classified as Paadal Petra Sthalam.