Apatsahayesvarar Temple, Alangudi or Guru Sthalam or Tiru Irum Poolai is a Hindu temple dedicated to Shiva located in the village of Alangudi in the Valangaiman taluk of Tiruvarur district, Tamil Nadu, India. Shiva is worshipped as Apathsahyesvarar, and is represented by the lingam. His consort Parvati is depicted as Elavarkuzhali. 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.