Sudhangshu Seal (Shudhangshu Shil; born 27 March 1945) was a member of the 14th Lok Sabha of India. He represented the Kolkata North West constituency of West Bengal and is a member of the Communist Party of India (Marxist) (CPI(M)) political party.
Currently, he is the councillor of ward no. 20 of Kolkata Municipal Corporation. In the K.M.C election 2010, he was chosen as the Left Front's mayoral candidate. After the Left Front lost the election to the Trinamool Congress, the CPI(M) leadership denied him the post of the Leader of the Opposition and former CPI(M) MLA and councillor Rupa Bagchi took office as the leader of the opposition.