The patron of Montelibretti is Saint Nicholas of Bari, celebrated on 9 and 10 May with a procession and cattle fair in the Church of San Nicola di Bari.
The town's other patron, Our Lady of Mount Carmel, is instead celebrated on the second Saturday of October. Since 1974, the Spring Feast has also been held, a Renaissance historical re-enactment with a parade in sixteenth-century costume, the Palio degli Anelli and horseback games. The town also holds the Castello Barberini.