Map - Kalyani, West Bengal (Kalyani)

Kalyani is a planned urban city in Nadia district in the Indian state of West Bengal. It is also a municipality and Community Development Block in Nadia. It is located around 50 kilometres (31 miles) from Kolkata — the capital of West Bengal. Kalyani is the administrative headquarters of Kalyani subdivision. It resides on the eastern banks of Hooghly River, and is part of the Kolkata Metropolitan Development Authority (KMDA).

During the period of World War II, the surroundings of the then Chandamari village was purportedly 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. Later, after the surrender of Japan and the independence of India, the air base was abandoned. On the same area, a planned town named "Kalyani" was developed by the Government of West Bengal in 1951 on the behest of Bidhan Chandra Roy – the second Chief Minister of West Bengal – for hosting the Indian National Congress meeting and to accommodate the housing needs of the growing population of Calcutta. Kalyani, being a planned town, is characterized by underground sewage system, paved roads forming rectangular grids, tree-lined avenues and community parks.

Kalyani has a dedicated industrial zone including Andrew Yule and Company, Kalyani Breweries (UB Group), Black Label beer and Dabur, TDK-EPCOS, though many of the industries have either closed or stopped production. It is an important centre of education in West Bengal, with two universities (University of Kalyani and Bidhan Chandra Krishi Viswavidyalaya), IISER, IIIT Kalyani, All India Institute of Medical Sciences, Kalyani, College of Medicine & JNM Hospital, Kalyani Government Engineering College and other institutes of higher education and research. Kalyani Stadium has emerged as an alternative location to Kolkata for holding numerous I-League football matches and other sporting events. The Bengal Cricket Academy and a stadium have been established by Cricket Association of Bengal in Kalyani for promotion and development of cricket.

Kalyani, located in Nadia district in the state of West Bengal, is a relatively young town. During the Second World War, Kalyani, was the site of an American military airbase, formed out of 45 villages in the district of Nadia.

The military garrison town was named after the then-sitting President of the United States Franklin D. Roosevelt as "Roosevelt Town" or "Roosevelt Nagar", with "nagar" meaning "town" in many Indo-Aryan languages, including Bengali. Hangars and other reminders of the airfield are still visible in the 'A' Block and some areas around Kalyani University, whose buildings were built on or over the runways. After World War II, the United States Army Air Force left the base, and the airfield and hangars went into disuse.

The development of modern Kalyani is credited to the former Chief Minister of West Bengal, Bidhan Chandra Roy. After the independence of India in 1947, the master plan of the town was developed and the foundation stone for the town was laid by the then Governor of West Bengal, Kailashnath Katju, on 24 February 1951. The town was built quickly in order to host the 59th Indian National Congress meeting in 1954. In memoriam of that conference, a road of the town was named as 'Congress Road'. In 1957, the Kalyani police station was formed, and in 1979, the rail line was extended from Kalyani Central to Kalyani Simanta station, and also established direct connectivity to Kolkata through Kalyani Simanta local EMU trains.

In 1995, Kalyani Municipality was established, which has been crucial in the development of infrastructure in Kalyani. In 2014, Kalyani was selected as a candidate for a "Smart City" project.