List of million-plus agglomerations in India in the context of "Kolkata"

Kolkata, also known as Calcutta (its official name until 2001), is the capital and largest city of the Indian state of West Bengal. It lies on the eastern bank of the Hooghly River, 80 km (50 mi) west of the border with Bangladesh. It is the primary financial and commercial centre of eastern and one of the gateways to northeastern India. Kolkata is the seventh most populous city in India with an estimated city proper population of 4.5 million (0.45 crore) while its metropolitan region Kolkata Metropolitan Area is the third most populous metropolitan region of India with a metro population of over 15 million (1.5 crore). Kolkata is regarded by many sources as the cultural capital of India and a historically and culturally significant city in the historic region of Bengal.

The three villages that predated Calcutta were ruled by the Nawab of Bengal under Mughal suzerainty. After the Nawab granted the East India Company a trading license in 1690, the area was developed by the Company into Fort William. Nawab Siraj ud-Daulah occupied the fort in 1756 but was defeated at the Battle of Plassey in 1757, after his general Mir Jafar mutinied in support of the company, and was later made the Nawab for a brief time. Under company and later crown rule, Calcutta served as the de facto capital of India until 1911. Calcutta was the second largest city in the British Empire, after London, and was the centre of bureaucracy, politics, law, education, science and the arts in India. The city was associated with many of the figures and movements of the Bengali Renaissance. It was the hotbed of the Indian nationalist movement.

Ahmedabad (/ˈɑːmədəbæd, -bɑːd/ AH-mə-də-ba(h)d), also spelled Amdavad (Gujarati: [ˈəmdɑʋɑd]), is the most populous city in the Indian state of Gujarat. It is the administrative headquarters of the Ahmedabad district and the seat of the Gujarat High Court. Ahmedabad's population of 5,570,585 (per the 2011 population census) makes it the fifth-most populous city in India, and the encompassing urban agglomeration population was estimated at 8,854,444 (as of 2024) is the seventh-most populous in India. Ahmedabad is located near the banks of the Sabarmati River, 25 km (16 mi) from the capital of Gujarat, Gandhinagar, also known as its twin city.

Ahmedabad has emerged as an important economic and industrial hub in India. It is the second-largest producer of cotton in India, due to which it was known as the 'Manchester of India' along with Kanpur. Ahmedabad Stock Exchange (before it was shut down in 2018) was the country's second-oldest. Cricket is a popular sport in Ahmedabad; the newly built Narendra Modi Stadium at Motera can accommodate 132,000 spectators, making it the largest stadium in the world. The planned Sardar Vallabhbhai Patel Sports Enclave will be one of the biggest sports centres (Sports City) in India once complete.