An explosion at a military storage facility in Lagos, Nigeria, kills at least 1,100 people and displaces over 20,000 others.

The Lagos armoury explosion was the accidental detonation of a large stock of high explosives at a military storage facility in the city of Lagos, Nigeria, on 27 January 2002. The fires created by the debris from this explosion burnt down a large section of Northern Lagos, and created a panic that spread to other areas. As people fled the flames, many stumbled into a concealed canal and drowned. The explosion and its aftermath are believed to have killed at least 1,100 people and displaced over 20,000, with many thousands injured or homeless. The government of Nigeria launched an enquiry, which blamed the Nigerian Army for failing to properly maintain the base, or to decommission it when instructed to do so in 2001.

Lagos, or Lagos City, is a large metropolitan city in southwestern Nigeria. With upper estimates of its population exceeding 21 million people in 2019, it is the largest city in Nigeria, the most populous urban area on the African continent, and one of the fastest-growing megacities in the world. Lagos was the national capital of Nigeria until the government's December 1991 decision to move their capital to Abuja, in the centre of the country. Lagos is a major African financial centre and is the economic hub of Lagos State and Nigeria at large. The city has a significant influence on commerce, entertainment, technology, education, politics, tourism, art, and fashion in Africa. Lagos is also among the top ten of the world's fastest-growing cities and urban areas. A megacity, it has the second-highest GDP in Africa, and houses one of the largest and busiest seaports on the continent. Due to the large urban population and port traffic volumes, Lagos is classified as a Medium-Port Megacity.