B.B.D. Bag formerly called Dalhousie Square, is the shortened version for Benoy-Badal-Dinesh Bag .It is the seat of power of the state government, as well as the central business district in Kolkata in the Indian state of West Bengal. BBD bag stands for Binoy Badal Dinesh who were the freedom fighters and killed Inspector General of Prisons, N.S. Simpson, in the balconies of Writers' Building. Previously the square had been named after Lord Dalhousie, Governor General of India from 1847 to 1856.
B. B. D. Bagh is considered to be the 'heart' of Kolkata as many famous buildings housing important businesses and banks are located here. Writer's Building-secretariat of West Bengal government: The Writers' Building (Bengali:Mahakaran) is the secretariat building of the State Government of West Bengal in India. It is and is located in West Bengal's capital city of Kolkata.
St. John's Church is all situated around the square. The place is locally known as the Office Para - meaning the locality of offices. A large part of the daily commuters to Kolkata from the neighbourhood area comes here for livelihood. The square is famous for the cheap food vendors that sell ready foods throughout the day to all the clerks and officers that work in the offices. The building is supposedly the oldest piece of masonry in Calcutta.B.B.D.Bagh also has statue of famous philanthropist Maharaja Lakshmeshwar Singh of Darbhanga(1858 -1898) sculpted by Edward Onslow Ford.