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A flagship is the lead ship in a fleet of vessels, a designation given on account of being either the largest, fastest, newest, most heavily armed or, for publicity purposes, the best known. In military terms, it is a ship used by the commanding officer of a group of naval ships. The term originates from the custom of the commanding officer (usually, but not always, a flag officer) to fly a distinguishing flag.

Used in this way, "flagship" is fundamentally a temporary designation; the flagship is wherever the admiral's flag is being flown. However, admirals have always needed additional facilities; a meeting room large enough to hold all the captains of the fleet, and a place for the admiral's staff to make plans and draw up orders.