Mythus may refer to:
Mythos, the underlying belief system of a society "Mythus", the first and only published setting for the Dangerous Journeys role-playing game, created by Gary Gygax The Mythus, an alternative, popular book title for Der Mythus des 20. Jahrhunderts (The Myth of the Twentieth Century) by Nazi author Alfred Rosenberg Mythus, Aeon of Enigmata in Honkai: Star Rail