Kalyani is a city and a municipality of Nadia district in the Indian state of West Bengal. It is the headquarters of Kalyani subdivision. It is a part of the area covered by Kolkata Metropolitan Development Authority. During the period of World War II, the surroundings of the then Chandamari village was used as an air base by the United States Army Air Forces, and was known by the name of "Roosevelt Town" or "Roosevelt Nagar", after then US President Franklin D. Roosevelt.