BAE Systems plc (LSE: BA.) is a British multinational defence, security and aerospace company headquartered in London, United Kingdom, that has global interests, particularly in North America through its subsidiary BAE Systems Inc. BAE is among the world's largest military contractors; in 2009 it was the second-largest based on revenues.

BAE Systems was formed on 30 November 1999 by the £7.7 billion merger of British Aerospace (BAe) and Marconi Electronic Systems (MES). As a result, BAE Systems is the successor to many of the most famous British aircraft, defence electronics and warship manufacturers. Predecessor companies built the Comet, the world's first commercial jet airliner; the Harrier "jump jet", the world's first operational Vertical/Short Take-Off and Landing (VTOL) aircraft; the "groundbreaking" Blue Vixen radar carried by Sea Harrier FA2s and which formed the basis of the Eurofighter's CAPTOR radar; and co-produced the iconic Concorde supersonic airliner with Aérospatiale.

British Aerospace was a civil and military aircraft manufacturer, as well as a provider of military land systems. The company had emerged from the massive consolidation of UK aircraft manufacturers since World War II. British Aerospace was formed on 29 April 1977 by the nationalisation and merger of The British Aircraft Corporation (BAC), the Hawker Siddeley Group and Scottish Aviation. Both BAC and Hawker Siddeley were themselves the result of various mergers and acquisitions.

Marconi Electronic Systems was the defence subsidiary of British engineering firm The General Electric Company (GEC), dealing largely in military systems integration, as well as naval and land systems. Marconi's heritage dates back to Guglielmo Marconi's Wireless Telegraph & Signal Company, founded in 1897. GEC purchased English Electric (which included Marconi) in 1968 and thereafter used the Marconi brand for its defence businesses (as GEC-Marconi and later Marconi Electronic Systems). GEC's own defence heritage dates back to World War I, when its contribution to the war effort included radios and bulbs. World War II consolidated this position, as the company was involved in important technological advances, notably the cavity magnetron for radar. Between 1945 and 1999, GEC-Marconi/Marconi Electronic Systems became one of the world's most important defence contractors. GEC's major defence related acquisitions included Associated Electrical Industries in 1967, Yarrow Shipbuilders in 1985, Plessey companies in 1989, parts of Ferranti's defence business in 1990, Vickers Shipbuilding and Engineering in 1995 and Kværner Govan in 1999. In June 1998, MES acquired Tracor, a major American defence contractor, for £830 million (approx. US$1.4 billion c. 1998).

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