Kunnathur is the only Scheduled Caste reserved legislative assembly constituency in Kollam district of Kerala, India.

[1] As of the 2021 assembly elections, the current MLA is Kovoor Kunjumon of RSP(L).

As per the recent changes on assembly constituency delimitations, the Kunnathur assembly constituency consists of East Kallada, Munroe Island, Kunnathur, Mynagappally, Poruvazhy, Sasthamcotta, Sooranad North, Sooranad South, West Kallada, Pavithreswaram Panchayats in Kollam district.

It officially became an SC reserved constituency since Kerala State Assembly Election 1967.

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