Velikkakathu Sankaran Achuthanandan (Malayalam : വേലിക്കകത്ത് ശങ്കരന്‍ അച്യുതാനന്ദന്‍) (born 20 October 1923) is an Indian politician who was Chief Minister of Kerala from 2006 to 2011. He has been Leader of the Opposition in Kerala since 2011. Achuthanandan was a member of the Politburo of the Communist Party of India (Marxist) beginning in 1985, and until July 2009, when he was reverted to the Central Committee of the party owing to his ideological dispositions.