Admiral Sir Antony David Radakin is a retired senior Royal Navy officer who served as Chief of the Defence Staff, the professional head of the British Armed Forces, from November 2021 to September 2025. Prior to this, he was the First Sea Lord, the professional head of the Naval Service, from June 2019 to November 2021. He also held roles as Chief of Staff, Joint Forces Command, and Second Sea Lord and Deputy Chief of the Naval Staff.