The Second Fleet of the Galactic Alliance Defense Fleet was one of the four Alliance fleets during the latter portion of the Yuuzhan Vong Invasion. It was formed out of the New Republic Second Battle Group.
Under the command of General Garm Bel Iblis, the fleet was active in the Core Worlds, liberating Corulag from the Yuuzhan Vong during the Battle of Corulag. The Second Fleet also participated in the Battle of Yuuzhan'tar. With the establishment of the Fifth Fleet following the war, several of the Second Fleet's more veteran ships and crews were attached to the new fleet, including the Mon Mothma.
In the years following the end of the Vong war, the Second Fleet made an annual run up and down the route of the Vong invasion path, searching for any holdouts.
In 40 ABY, a task force of the Second Fleet under Admiral Matric Klauskin participated in an show of force in the Corellian system. With the failure of the operation, Klauskin chose to attack and occupy the Corellian world of Tralus to save face, opening the Second Galactic Civil War. When Klauskin was deemed crazy and replaced, Admiral Tarla Limpan took over his position as leader of the Second Fleet.
- The New Jedi Order: The Unifying Force (First appearance)
- Legacy of the Force: Betrayal
- Legacy of the Force: Exile
- Legacy of the Force: Fury