Chadayamangalam is a legislative assembly constituency in the south-eastern area of Kollam district in Kerala, India.

[1] As of the 2021 assembly elections, the current MLA is J. Chinchu Rani of CPI.

As per the recent changes on assembly constituency delimitations, the Chadayamangalam assembly constituency consists of Alayamon Panchayat in Punalur Taluk and Chadayamangalam, Chithara, Elamad, Ittiva, Kadakkal, Nilamel and Velinalloor Panchayats in Kottarakkara Taluk.

[2][3] The following list contains all members of Kerala legislative assembly who have represented the constituency: Percentage change (±%) denotes the change in the number of votes from the immediate previous election.

There were 1,97,285 registered voters in the constituency for the 2021 Kerala Niyamasabha Election.