The patrons of Civita Castellana are Saints John and Marcian, Roman martyrs, celebrated on 16 September.
The town also has two cherished traditions: the historic Carnevale Civitonico, one of Lazio's historic carnivals, with a parade of allegorical floats and costumed groups, and the Ludi Borgiani, the historical procession re-enacting the arrival of Pope Alexander VI Borgia.