The patrons of Ostellato are Saints Peter and Paul, celebrated on 29 June in the Church of Santi Pietro e Paolo.
The municipal coat of arms currently in use became official in the Napoleonic era and made its first official appearance on the banner during the festivities for the visit of Pope Pius IX, in 1857. The town also holds the Museo del Territorio di Ostellato and the Church of San Vito.