Karthika Mathew (born Lidiya Jacob), better known mononymously as Karthika, is an Indian former actress, who has appeared in several Malayalam and Tamil films. She is best known for her performances in Nam Naadu and Dindigul Sarathy.^[1]

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Lidiya Jacob is born at Malayidamthuruthu to Puramadam Veetil P.K Jacob and Alice. She had her primary education from Bethelhem Girls High School, Njaralloor, Kochi. She married her longtime boyfriend Merin Mathew on 18 May 2009. The couple have a son, born in July 2013.