San Niccolò, Monastery and church complex in Prato, Italy.

San Niccolò is a Dominican monastery ensemble in Prato featuring colored marble altars, Renaissance tabernacles, and extensive interior frescoes from the 14th and 15th centuries that line the walls. The building complex combines a church, residential quarters for nuns, and auxiliary structures in an organic spatial arrangement.

Built in 1323–1328 on a bequest from Cardinal Niccolò Alberti, known as Niccolò da Prato, the church and Dominican nunnery were enlarged several times; the church was completely remodelled in the 17th century and redecorated around 1720. In 1785 the complex became a college for daughters of the Tuscan nobility, the origin of its name as a conservatorio.

The name "conservatorio" comes from the institution founded here in 1785 for daughters of the Tuscan nobility, meant to "keep in serbanza" — safeguard — young noblewomen. Teaching had begun on the site as early as 1327, and the school still runs a nursery, primary and secondary classes and a liceo. Since 2019 the monastery rooms host modern and contemporary art exhibitions.

This site now operates as an educational institution, offering visits to the church and certain areas at specific times for visitors. It is advisable to check visiting conditions beforehand, as the school's operations take priority over general access.

Within the garden sits a replica of Rome's Scala Santa, the sacred staircase that pilgrims could climb for prayer and contemplation without traveling far from home. This copy shows how monasteries brought spiritual destinations to their own communities.