Saints Constantine and Helen Greek Orthodox Church on Manchester Avenue in Encinitas's Cardiff-by-the-Sea serves the Eastern Orthodox Christian community of North San Diego County under the Greek Orthodox Metropolis of San Francisco. The parish operates an Academy Preschool and Greek Language School on-site, integrating early-childhood education and Hellenic cultural programming into the same Cardiff community infrastructure supported by organizations like the Community Resource Center. Sunday services follow the Byzantine Rite with Orthros at 8:30 and Divine Liturgy at 10:00, led by presiding priest Rev Fr Michael Sitaras and assistant priest Rev Fr Angelo Maginas. The campus sits just east of Interstate 5 at the Manchester Avenue exit near San Elijo Lagoon, connecting the parish to the broader network of youth and family programs offered by institutions like the Magdalena Ecke Family YMCA. The church hosts an annual Greek Festival featuring traditional cuisine, live Hellenic music, and folk dance performances that function as one of Cardiff-by-the-Sea's largest single-weekend cultural events.