The Capitol Complex is part of the group of 17 sites - across seven countries (France, Switzerland, Belgium, Germany, Argentina, Japan and India) - designed by Franco-Swiss architect Le Corbusier which were included in the list by the Paris-based body.
Charles-Edouard Jeanneret-Gris, better known as Le Corbusier, had planned Chandigarh in the 1950s.
The city administration in a statement expressed gratitude to local BJP MP Kirron Kher, Union ministries of Culture and External Affairs, the representative of India to UNESCO and Le Corbusier's foundation, Paris.
"It is a moment of pride for our city. The administration assures all the residents that we will conserve and preserve this heritage site and make the city a major international tourism destination," Rai Parimal Rai, Adviser to the Administrator, Chandigarh Administration, said.
The Fondation Le Corbusier in a statement said: "The preservation of the modern heritage and more specifically of Le Corbusier's architectural work is a long-term venture.
"The inscription on the World Heritage List of 17 buildings designed by Le Corbusier encourages everyone to maintain his work and hand over this living heritage to the future generations. It also contributes to the understanding of that complex and fragile legacy and helps its dissemination to the widest audience.