T. M. Thomas Isaac (born 1952) is a central committee member of the Communist Party of India (Marxist), and represents Alappuzha constituency in the Kerala State Legislative Assembly. During his tenure as a member of the Kerala State Planning Board, he was in charge of the People's Plan campaign(PPC) in Kerala.People's Plan Campaign is considered as a landmark in the history of decentralisation experience not only in Kerala but all over India.