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A refit (sometimes known as a retrofit) is a process whereby a ship, space station, starship or other vessel has new fittings and technologies installed, replacing outdated equipment. Ship and starship refits usually take place in a drydock.

Some refits could create a subclass or new class of starship. Examples of this include refits to the starships USS Jenghiz (NCC-501) and USS Siva (NCC-520), creating the  and  starship classes respectively. (Jackill's Starfleet Reference Manual: Ships of the Fleet, vol. 1, 2006 edition; Starfleet Prototypes)