San Pietro in Carnia, Gothic church in Zuglio, Italy.

San Pietro in Carnia is a Gothic church in Zuglio, built in 1312 under Patriarch Ottobuono di Razzi. It has a single nave with three altars, a raised presbytery, and a Romanesque mullioned window in the atrium. The side walls are supported by buttresses added in the early 16th century, when the original truss roof was replaced by ribbed vaults.

The church was built in 1312 under the commission of the Patriarch of Aquileia Ottobuono di Razzi and replaced an earlier place of worship. The former structure had been destroyed in the 8th century by outside forces.

Each year on Ascension Day, parishes once under the pieve's jurisdiction bring their processional crosses decorated with coloured ribbons to honour the 14th-century silver cross, made in a Florentine workshop, kept in the mother church. A procession to the pieve follows, with Mass celebrated by the Archbishop of Udine, the parish priest of Zuglio and the priests of the Bût valley.

The church stands on a plateau above the Bût valley, with the archaeological museum in Zuglio's centre below. The Ascension Day rite of the Bacio delle Croci draws parishes from across the valley, so expect crowds then. The building shows layers from different centuries, including a 1740 walnut staircase to the upper sacristy.

During Ascension Day celebrations, parishes from surrounding areas bring their crosses to this mother church in a special ceremony. This tradition demonstrates how the church remains central to the spiritual life of the entire valley.