Halcyon is an unincorporated community of about 125 acres (50 ha) in San Luis Obispo County, California, United States, just south of Arroyo Grande. It was founded in 1903 as a Theosophical intentional community and is the home and headquarters of a religious organization, The Temple of the People (not to be confused with Jim Jones and the Peoples Temple). The Temple group was founded in 1898.