Vāraṇādrīśa, more commonly referred to as Pillai Lokacharya (Tamil: பிள்ளை லோகாசாரியார்) (1205–1311 CE), was a prominent Sri Vaishnava leader and philosopher who authored several works important to Vishishtadvaita philosophy.

Lokacharya is the author of several works called Ashtadasa Rahasyangal (Eighteen Secrets) which were added to by his disciples and influenced a large, if licentious, following.

This school adopted the unique doctrine of doshabhogya, ‘sin-enjoyment', which holds that God enjoys, and indeed encourages, sin, the pleasures of the flesh, and moral transgression, since these provide a vehicle for the operation of divine grace, forgiveness, and love.

Pillai Lokacharya is stated to have fallen ill due to a fall from a nearby hill (today known as Yanamalai) and died in the year 1311 CE.

Upon his deathbed, he advised his disciples such as Koorakuloththama Dasa and Vilanjsolai Pillai that Srisailesa was working for the king at Madurai, and that they should bring him back into the Sri Vaishnava fold.

One of Pillai Lokacharya's best known disciples was Manavala Mamunigal, who was a radical proponent of Sri Vaishnavism, and is revered prominently in the Tenkalai (southern art) denomination.