Poykayil Sree Kumara Gurudevan, known as Poykayil Appachan or Poykayil Yohannan, was a spiritual leader, poet, Dalit emancipator, renaissance leader and the founder of the Prathyaksha Raksha Daiva Sabha, a socio-religious movement dedicated to the spiritual liberation and social upliftment of the oppressed castes of Kerala.