Preserver can refer to:
Life preserver, a personal flotation device or lifebuoy Life preserver, a type of club (weapon) , a Canadian navy ship , Protecteur-class supply ship , leadship of the Fairmile-support depot ships , a U.S. navy ship Preserver (Elfquest), a race in the fantasy comic Elfquest Preservers (Star Trek), a Star Trek species Preserver (Star Trek), a novel by William Shatner