The patron of Castiglione Messer Raimondo is Saint Donatus the Martyr, whose body is venerated in the Santuario di San Donato Martire, and who is celebrated on 7 August.
Every five years, on 7 August, the saint's body is carried in solemn procession through the town's streets. The town holds the Parish Church of San Giovanni Bosco and the Church of Santa Maria dello Spino.