A grotto is a natural or artificial cave. Grotto may also refer to: Organizations Grotto (National Speleological Society), an internal organization Grotto (Satanism), a clandestine association or gathering Mystic Order of Veiled Prophets of the Enchanted Realm (The Grotto), an appendant body in Freemasonry Places Grotto, Washington, an unincorporated US community Grotto of the Redemption, a religious shrine in Iowa, US The Grotto (Portland, Oregon), a US Catholic sanctuary The Grotto, a feature of the Playboy Mansion The Grotto (San Antonio), Texas, US The Grotto, Victoria, a geological formation in Australia The Grotto, a natural cavern in Bruce Peninsula National Park, Ontario, Canada Grotten (), a state-owned honorary residence in Oslo, Norway Other uses Grotto (comics), a Marvel comics character The Grotto (album), 2003, by Kristin Hersh See also Blue Grotto (disambiguation) Christmas grotto, an annual Santa Claus-themed staging in retail centers Santa's Grotto, a similar concept themed to Santa's workshop Grotta-Pelos culture, a phase of Cycladic civilization