Autonomy Systems Ltd. () is an enterprise software company based in Cambridge, United Kingdom and San Francisco, USA. It develops a variety of knowledge management applications using pattern recognition techniques.

Autonomy s software is used by various large global corporations and public sector agencies, including Deutsche Bank, BBC, Frito-lay/Pepsico, NASA, T-Mobile, Hewlett Packard, Royal Dutch Shell, Citigroup, Phillips, Vodafone, Department of Homeland Security, the SEC and the UK Houses of Parliament.

Autonomy was founded in Cambridge, England in 1996 by Dr Michael Lynch (entrepreneur) as a spinoff from Cambridge Neurodynamics Ltd. Autonomy is currently listed on the London Stock Exchange. In June 2005, Autonomy acquired etalk, German company Global linx, and Virage, a software developer of Video search software.