Ilayankudi Maranar also known Ilaiyangudi Nayanar, is a Nayanar saint, venerated in the Hindu sect of Shaivism. He is generally counted as the fourth in the list of 63 Nayanars. He is also called Marar, Maran and Mara Nayanar, names he shares with Somasi Mara Nayanar. The two Nayanars are generally differentiated by the prefixes "Ilayankudi" and "Somasi".

Ilayankudi Maranar (Marar) was born in Ilaiyangudi (also spelled as Ilayankudi and Ilayangudi), presently in Sivaganga district of the Indian state of Tamil Nadu. He derives his name from his birthplace. Marar was a Vellalar by caste and worked as a farmer. He accumulated great wealth through agriculture. He was a staunch devotee of the god Shiva, the patron god of Shaivism, and served the god and his devotees. He used to welcome devotees of Shiva to his home, ritually wash their feet and feed them a feast.