Coordinates: 51°16′43″N 0°47′33″W / 51.27861°N 0.7925°W / 51.27861; -0.7925

Qinetiq ( /kɪˈnɛtɪk/ as in kinetic; officially styled QinetiQ) is a British multinational defence technology company headquartered in Farnborough, United Kingdom. It is the world's 43rd-largest defence contractor measured by 2010 defence revenues, and the fifth-largest based in the UK.

Qinetiq was formed from the greater part of the former UK government agency, Defence Evaluation and Research Agency (DERA), when it was split up in June 2001 (with the smaller part becoming Dstl). It has major sites in the UK at Farnborough, Hampshire, MoD Boscombe Down, Wiltshire, and Malvern, Worcestershire where it was formerly DERA and is the largest single employer in the area. Since its formation it has made numerous acquisitions, primarily of United States-based companies. Former Central Intelligence Agency Director George Tenet served as an independent non-executive director to Qinetiq's board between October 2006 and January 2008.