Dayman may refer to:
People Dayman (surname)
Places Daymán River, Uruguay Dayman Island, a privately owned island off the coast of British Columbia, Canada Dayman Island, Queensland, one of the Torres Strait Islands located between Australia and New Guinea Cape Dayman, Victoria Land, Antarctica
Other Dayman, a fictional heroic character referenced in the television show It's Always Sunny in Philadelphia and the musical The Nightman Cometh
See also Dayman Big-eyed Tree Frog, Nyctimystes daymani Daysman (disambiguation)