Naiṣkarmya-siddhi is a treatise on Advaita Vedanta written by Sureśvara, one of the direct disciples of Ādi Śaṅkara, in approximately the 8th Century CE. It comprises 423 verses divided into four chapters. Along with Brahma-siddhi of Maṇḍana Miśra, the Advaita-siddhi of Madhusūdana Sarasvatī and the Iṣṭa-siddhi of Vimuktātman, it is considered to be one of the four most important works in the siddhi-literature tradition of Advaita, which comprises the stating of the essence of Advaita along with new facets brought out by defending the theology from rival schools.