Ultimax may refer to:
US sames name for the Commodore MAX Machine Ultimax 100, a firearm Persona 4 Arena Ultimax, a 2013 video game A model of engine used by the Doble steam car A brand of sock formerly sold by the Wigwam Mills hosiery company The Ultimax Man, a 1978 novel by Keith Laumer An alias of the DC Comics supervillain Brain