The Birmingham Six were six men—Hugh Callaghan, Patrick Joseph Hill, Gerard Hunter, Richard McIlkenny, William Power and John Walker—sentenced to life imprisonment in 1975 in England for the Birmingham pub bombings. Their convictions were declared unsafe and unsatisfactory and quashed by the Court of Appeal on 14 March 1991. The six men were later awarded compensation ranging from £840,000 to £1.2 million.

The Birmingham pub bombings took place on 21 November 1974 and were attributed to the Provisional IRA. The devices were placed in two central Birmingham pubs: the Mulberry Bush at the foot of the Rotunda, and the Tavern in the Town – a basement pub on New Street. The resulting explosions, at 20:25 and 20:27, collectively were the most injurious and serious terrorist blasts in Great Britain up until that point; 21 people were killed (ten at the Mulberry Bush and eleven at the Tavern in the Town) and 182 people were injured. A third device, outside a bank on Hagley Road, failed to detonate.

Birmingham (ⁱ/ˈbɜrmɪŋəm/ BUR-ming-əm, locally /ˈbɜrmɪŋɡəm/ BUR-ming-gəm) is a city and metropolitan borough in the West Midlands of England. It is the most populous British city outside the capital London, with a population of 1,036,900 (2010 estimate), and lies at the heart of the West Midlands conurbation, the second most populous urban area in the United Kingdom with a population of 2,284,093 (2001 census). Birmingham's metropolitan area is also the United Kingdom's second most populous with a population of 3,683,000.

A medium-sized market town during the medieval period, Birmingham grew to international prominence in the 18th century at the heart of the Midlands Enlightenment and subsequent Industrial Revolution, which saw the town at the forefront of worldwide developments in science, technology and economic organisation, producing a series of innovations that laid many of the foundations of modern industrial society. By 1791 it was being hailed as "the first manufacturing town in the world". Birmingham's distinctive economic profile, with thousands of small workshops practising a wide variety of specialised and highly-skilled trades, encouraged exceptional levels of creativity and innovation and provided a diverse and resilient economic base for industrial prosperity that was to last into the final quarter of the 20th century. Its resulting high level of social mobility also fostered a culture of broad-based political radicalism, that under leaders from Thomas Attwood to Joseph Chamberlain was to give it a political influence unparalleled in Britain outside London and a pivotal role in the development of British democracy.