St. Katherine Orthodox Church in Carlsbad is a parish of the Orthodox Church in America, meeting since 2011 at 2720 Loker Avenue West in the 92010 Poinsettia corridor east of Interstate 5. The mission preserves the liturgical and sacramental traditions of Eastern Orthodoxy while conducting all services in English, a dual commitment to ancient practice and local accessibility that resonates with the preservation ethos of the Carlsbad Historical Society. Worship follows the Divine Liturgy of St. John Chrysostom, with a full annual cycle of Vespers, Matins, and feast-day celebrations drawn from the Orthodox lectionary. The parish supports Project Mexico's Swim for Hope fundraiser, sending volunteer teams to Baja California to fund education for orphaned children at St. Innocent Orphanage, a service-learning model also championed by vocational programs at Theoria Technical College nearby. The congregation's four-part a cappella choir performs the Obikhod chant repertoire without instrumental accompaniment, maintaining the Byzantine vocal tradition across every liturgical season.