P. K. Kunjachan (October 1925 – 14 June 1991) was a Communist Party of India (Marxist) politician from Kerala, India. Before formation of Kerala state he was a member of the Tirukochi Legislative Assembly during the period 1954-1956. After formation of the state, he represented the Mavelikara constituency in the first and second Kerala Legislative Assemblies and the Pandalam constituency in the Third Legislative Assembly. Kunjachan was a member of Rajya Sabha from 1973–79 and 1988-91.