Biblioteca comunale degli Intronati, Public library and archive in Siena, Italy.

The Biblioteca comunale degli Intronati occupies a historic building at Via della Sapienza 3 in Siena. Its holdings exceed half a million printed books and manuscripts, divided into twenty-nine archival series. The reading room displays a 1924 bust of Federigo Tozzi by Ercole Drei, and a plaque above the historical reading room entrance bears the six Latin statutes of the old Accademia.

Sallustio Bandini founded the library in 1758 by donating his personal collection to the University of Siena, establishing a foundation for public access to knowledge. This donation marked the start of its role as an open institution serving the city.

The library displays manuscript collections from Santa Maria della Scala and houses illuminated manuscripts with Renaissance illustrations in its historic rooms. Visitors can observe these precious works and understand the artistic traditions connected to the city.

The library is at Via della Sapienza 3, in the old centre of Siena, a short walk from Piazza del Campo. The entrance to the historical reading room carries a plaque with the six Latin statutes of the Accademia degli Intronati. Administrative offices, a consultation room for old books and manuscripts, and the modern library occupy areas freed when the Museo archeologico nazionale moved to Santa Maria della Scala.

The Byzantine Gospel lectionary (Gregory-Aland ℓ 283) came to the library in 1786 from the treasury of Santa Maria della Scala, not from a 1786 acquisition of a medieval book. Above the Historical Reading Room door a plaque lists the six Latin statutes of the old Accademia degli Intronati, among them "Nemini credere" (Believe nobody).