Chathannoor or Chathannur is a legislative assembly constituency in Kollam district of Kerala, India.

As of the 2021 assembly elections, the current MLA is G. S. Jayalal of CPI.

In 1967, P. Ravindran of CPI became the first elected member from Chathannoor assembly constituency.

[4][5] As per the recent changes on assembly constituency delimitations, the Chathannoor assembly constituency consists of Paravur municipal town and 6 neighbouring panchayaths including Chathannoor, Adichanalloor, Chirakkara, Poothakkulam, Kalluvathukkal, Pooyappally.

[6][7] The following list contains all members of Kerala legislative assembly who have represented the constituency: * indicates bypolls Percentage change (±%) denotes the change in the number of votes from the immediate previous election.