The Secretary General of NATO (French: Secrétaire général de l'OTAN) is an international diplomat who serves as the chief civil servant of the North Atlantic Treaty Organization (NATO).

The Secretary General is responsible for coordinating the workings of the alliance, leading NATO's international staff, chairing the meetings of the North Atlantic Council and most major committees of the alliance, with the notable exception of the NATO Military Committee, and acting as NATO's spokesperson.

The current Secretary General is Jens Stoltenberg, the former Prime Minister of Norway, who took office on 1 October 2014.