P. C. Chacko is a former Member of Parliament from Thrissur Lok Sabha seat in Kerala. He is a former member of the Indian National Congress. Chacko resigned from Indian National Congress on 10 March 2021, stating that it had become difficult to be a congress leader in Kerala. P.C. Chacko is the first president of Thiruvananthapuram Distict committee of Kerala Students Union (KSU). He was the State president of Indian youth Congress from 1970-1973 and held the post of national General secretary of Indian youth Congress during 1973 - 1975. He became the General secretary of KPCC in 1975 and continued till 1979. He was elected to the Kerala Assembly in 1980 from Piravom constituency and during 1980- 81 he served as Minister for Industries in the state cabinet. He was Elected to Loksabha in 1991 from Thrissur,in 1996 from Mukundapuram ,in 1998 from Idukki and in 2009 again from Thrissur. On 2021 March 16 he joined in Nationalist Congress Party.