The British Security Industry Association (BSIA) is the trade association for the professional security industry in the UK.

Its members are responsible for more than 70% of privately provided UK security products and services (by turnover) including the manufacture, distribution and installation of electronic and physical security equipment and the provision of security guarding and consultancy services. Its members are industry professionals ranging in size from global companies to small and medium enterprises, offering quality products and services to a vast spectrum of end-users.