The state government also transferred incumbent Anuj Sharma as Additional Director General of the state CID before the assembly elections.
Jawed Shamim will be the new additional director general, law and order, of the West Bengal Police, taking over from Gyanwant Singh, the Mamata Banerjee government said in an order.
Ajay Kumar Nand will be the new commissioner of Barrackpore Police Commissionerate and Supratim Sarkar will take over as the Bidhanagar Police commissioner, it said.
Mitra has been holding the post of ADG, Training, of West Bengal Police, while Shamim is special commissioner I of Kolkata Police.
Elections to the 294-member state assembly are due in April-May this year.