Guising, guizing, a guiser or guizer may refer to: Guising, a Scottish and Irish tradition which is the origin of trick-or-treating Mummer, costume-wearing celebrant of medieval to early-modern times Guiser, an amateur actor in a mummers' play Guizer, member of an Up Helly Aa squad Guise dancing, Christmastide community mumming performed in Cornwall
See also Guise (disambiguation) Disguise Disguise (disambiguation) Trick or treat (disambiguation)