The patron saint of Sinalunga is Saint Martin of Tours, celebrated on 11 November in the Collegiate Church of San Martino.
In the rooms adjacent to the collegiate church's sacristy, a collection of sacred art is displayed, including important textile works such as liturgical vestments. The town also holds the Convent of San Bernardino and the Church of the Sacro Chiodo, as well as the Ciro Pinsuti Municipal Theatre.