A Command Fleet was a type of fleet that the Romulan Star Navy grouped its starships into.
During the Dominion War fourteen of the twenty-five fleets the Romulans sent to support the Federation Alliance were Command Fleets. The rest of the Command Fleets remained in the Romulan Star Empire to protect the Praetor, check his rivals ambitions and counter any invasion from the likes of the Taurhai or other enemies of the Empire. (The Dominion War Sourcebook: The Fires of Armageddon)
