Sir Kenneth Douglas McCallum KCB (born 1974) is a British intelligence officer who has been serving as the Director General of MI5 since 2020.

[1][2] McCallum has been an intelligence officer at MI5 for over two decades, including service focused on Northern Ireland-related terrorism and leading counter-terrorism investigations during the London 2012 Olympic Games.

[6][3] In 2021, McCallum said in his annual threat update that the activities of China, Russia, and other hostile states could have as large an impact on the public as terrorism, marking a significant shift in emphasis for the UK’s domestic spy agency.

[10] In a 2024 speech, he stated that Russia's intelligence agency has been on a mission to generate "mayhem on British and European streets".

[12] In the same podcast, McCallum spoke about the adjustment needed as the public head of MI5, “Having spent all of my career being the world’s most boring neighbour at barbecues, on the street, and being as deflective and uninteresting as you can possibly be, [it is] quite odd to then be on the telly.