The title held by the director of the Strategic Information Service (SIS) of the Galactic Republic was known as the Director of Republic Strategic Information Service, often shortened to Director of SIS. During the times of the Great Galactic War, the Cold War, and the Galactic War, the SIS functioned as the Republic's main intelligence organization.
- An unknown director (—3650 BBY)
- Marcus Trant (3650 BBY —)