Fire alert was an alert status aboard Federation starships in the 23rd century designated to prepare the crew for possible fires aboard the ship, usually caused by damage to ship systems during battle or other situations.

In 2265, Captain Kirk ordered all decks to go to fire alert when the USS Enterprise passed through the Galactic barrier, as the phenomena they were experiencing was causing circuitry blowouts to the ship's systems. (TOS: "Where No Man Has Gone Before")