Changanassery State assembly constituency is one of the 140 state legislative assembly constituencies at the state Kerala in southern India. It is also one of the 7 state legislative assembly constituencies included in the Mavelikara Lok Sabha constituency. C. F. Thomas represented the constituency for 40 consecutive years from 1980. In the 2021 Kerala legislative elections, Adv. of the Kerala Congress (M) was elected from the constituency.