Kottayam 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 Kottayam Lok Sabha constituency.

[1] As of the 2016 assembly elections, the current MLA is Thiruvanchoor Radhakrishnan of INC. Kottayam Niyama Sabha constituency is composed of the following local self-governed segments:[2] Percentage change (±%) denotes the change in the number of votes from the immediate previous election.

There were 164,097 registered voters in the constituency for the 2016 Kerala Niyamasabha Election.

[3] There were 148,225 registered voters in the constituency for the 2011 election.