The Bhopal disaster, also referred to as the Bhopal gas tragedy, was a chemical accident on the night of 23 December 1984 at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh, India. The industrial disaster is considered the world's worst in history. Over 500,000 people were exposed to methyl isocyanate (MIC) gas. The highly toxic substance made its way into and around the small towns located near the plant.

Estimates vary on the death toll. The official immediate death toll was 2,259. In 2008, the Government of Madhya Pradesh had paid compensation to the family members of 3,787 victims killed in the gas release, and to 574,366 injured victims. A government affidavit in 2006 stated that the leak caused 558,125 injuries, including 38,478 temporary partial injuries and approximately 3,900 severely and permanently disabling injuries. Others estimate that 8,000 died within two weeks, and another 8,000 or more have since died from gas-related diseases.The owner of the factory, UCIL, was majority owned by the Union Carbide Corporation (UCC), with Indian Government-controlled banks and the Indian public holding a 49.1 percent stake. In 1989, UCC paid $470 million (equivalent to $871 million in 2020) to settle litigation stemming from the disaster. In 1994, UCC sold its stake in UCIL to Eveready Industries India Limited (EIIL), which subsequently merged with McLeod Russel (India) Ltd. Eveready ended clean-up on the site in 1998, when it terminated its 99-year lease and turned over control of the site to the state government of Madhya Pradesh. Dow Chemical Company purchased UCC in 2001, seventeen years after the disaster.

Civil and criminal cases filed in the United States against UCC and Warren Anderson, UCC CEO at the time of the disaster, were dismissed and redirected to Indian courts on multiple occasions between 1986 and 2012, as the US courts focused on UCIL being a standalone entity of India. Civil and criminal cases were also filed in the District Court of Bhopal, India, involving UCC, UCIL, and UCC CEO Anderson. In June 2010, seven Indian nationals who were UCIL employees in 1984, including the former UCIL chairman, were convicted in Bhopal of causing death by negligence and sentenced to two years imprisonment and a fine of about $2,000 each, the maximum punishment allowed by Indian law. All were released on bail shortly after the verdict. An eighth former employee was also convicted, but died before the judgment was passed.

Bhopal (; Hindustani: [bʱoːpaːl] (listen)) is the capital city of the Indian state of Madhya Pradesh and the administrative headquarters of both Bhopal district and Bhopal division. It is known as the City of Lakes for its various natural and artificial lakes and for being one of the greenest cities in India. It is the 16th largest city in India and 131st in the world. After formation of Madhya Pradesh, the state capital Bhopal was a part of the Sehore district. It was bifurcated in 1972 and a new district Bhopal was formed. Flourishing around 1707, the city was the capital of the former Bhopal State, a princely state of the British ruled by the Nawabs of Bhopal. Numerous heritage structures from this period include the Taj-ul-Masajid and Taj Mahal palace. In 1984, the city was struck by the Bhopal disaster, one of the worst industrial disasters in history.

Bhopal has a strong economic base with numerous large and medium industries operating in and around the city. Bhopal is considered as one of the important financial and economic destinations in Madhya Pradesh's two strong wealth pillars, the other being Indore. Bhopal's GDP(nominal) was estimated at INR 30,467 crores (2016–17) by the Directorate of Economics and Statistics, Madhya Pradesh.

A Y-class city, Bhopal houses various educational and research institutions and installations of national importance, including ISRO's Master Control Facility, BHEL and AMPRI. Bhopal is home to a large number of institutes of National Importance in India, namely, IISER, MANIT, SPA, AIIMS, NLIU, IIFM, NIDMP and IIIT (currently functioning from a temporary campus inside MANIT). Bhopal city is also the divisional headquarter of Bhopal division of west central railways (WCR), whose office is located at Rani Kamlapati Railway Station (RKMP), formerly known as Habibganj.

The city attracted international attention in December 1984 after the Bhopal disaster, when a Union Carbide pesticide manufacturing plant (now owned by Dow Chemical Company) leaked a mixture of deadly gases composed mainly of methyl isocyanate, leading to one of the worst industrial disasters in the world's history. The Bhopal disaster continues to be a part of the socio-political debate and a logistical challenge for the people of Bhopal.Bhopal was selected as one of the first twenty Indian cities (the first phase) to be developed as a smart city under PM Narendra Modi's flagship Smart Cities Mission. Bhopal was also rated as the cleanest state capital city in India for three consecutive years, 2017, 2018 and 2019.