Welcome to the official website of the Secret Intelligence Service (SIS).
As Britain's secret service, SIS provides the British Government with a global covert capability to promote and defend the national security and economic well-being of the United Kingdom.
SIS operates world-wide to collect secret foreign intelligence in support of the British Government's policies and objectives.Regional instability, terrorism, the proliferation of weapons of mass destruction and illegal narcotics are among the major challenges of the 21st century. SIS assists the government to meet these challenges. To do this effectively SIS must protect the secrets of its sources and methods. This factor is reflected in our website.