Museo del tesoro di San Pietro, Religious treasury museum in St Peter's Basilica, Vatican City.

The Museo del Tesoro di San Pietro is a religious museum within the Basilica that displays sacred vestments, chalices, reliquaries, and liturgical objects from different periods. The exhibition rooms house items accumulated over centuries for the worship and ceremonies of the Basilica.

The treasury was already plundered in 846 and again in the Sack of Rome of 1527; the Treaty of Tolentino in 1797 brought further Napoleonic requisitions. What survives was reassembled and enriched with works from the old and the new basilica. The museum is entered from the sacristy corridor in the left transept.

On the feast of Saint Peter, a gilded 18th-century tiara and an altar frontal are used to dress the bronze statue of the saint. The display also holds the Crux vaticana, a 6th-century cross given by Emperor Justin II to Rome, and the greater staurotheke, a 10th–11th-century Byzantine reliquary donated in 1837 by a canon of Our Lady's basilica in Maastricht.

Access to the museum is from inside the Basilica through an interior corridor on the left side. Allow one to two hours to view the exhibition, and it makes sense to explore the main Basilica first before visiting.

The so-called Dalmatic of Charlemagne is in fact a Byzantine patriarchal sakkos of the 12th century, embroidered with sacred episodes; the label long tied it to the emperor. In the same room, the greater staurotheke, a Byzantine reliquary of the 10th–11th century, reached the museum in 1837 as a gift from a canon of Our Lady's Basilica in Maastricht.