Mount Ecclesia (dedicated on October 28, 1911) is the location of the international headquarters of the fraternal and service organization The Rosicrucian Fellowship (TRF), located on grounds in Oceanside, California. It is also the location of its spiritual temple, called The Ecclesia, situated upon the promontory of a high mesa overlooking the San Luis Rey River Valley and the Franciscan Mission San Luis Rey de Francia. On April 7, 1995, it was added to the National Register of Historic Places as the Rosicrucian Fellowship Temple.