Western India is a loosely defined region of India consisting of western states of Republic of India. The Ministry of Home Affairs in its Western Zonal Council Administrative division includes the states of Goa, Gujarat, and Maharashtra along with the Union territory of Dadra and Nagar Haveli and Daman and Diu, while the Ministry of Culture and some historians also include the state of Rajasthan. The Geological Survey of India includes Maharashtra but excludes Rajasthan whereas Ministry of Minority Affairs includes Karnataka but excludes Rajasthan.

Dadra and Nagar Haveli and Daman and Diu is a union territory in India. The territory was constituted through the merger of the former territories of Dadra and Nagar Haveli and Daman and Diu. Plans for the proposed merger were announced by the Government of India in July 2019; the necessary legislation was passed in the Parliament of India in December 2019 and came into effect on 26 January 2020. The territory is made up of four separate geographical entities: Dadra, Nagar Haveli, Daman, and the island of Diu. All four areas were formerly part of Portuguese India, and had a joint capital at Panjim, Goa along with Goa. They came under Indian rule in the mid-20th century after the Annexation of Goa and of the Free Dadra and Nagar Haveli. Goa, Daman and Diu were jointly administered until 1987, when Goa was granted statehood after the Konkani language agitation. The current capital is Daman and Silvassa is the largest city.