Palazzo Buonsignori, Gothic palace in Siena, Italy.

Palazzo Buonsignori is a Gothic palace in Siena featuring brick walls with a stone base and two levels of triple-arched windows separated by decorative cornices. The structure displays the characteristic design of patrician residences from that period with its distinctive window arrangement.

Built after 1440 for the banker Giovanni Bichi di Guccio, the palace passed to the Tegliacci in 1459 and was bought by the Bonsignori in 1476; their last heir left Siena. It was restored in the 19th century in a purist spirit, and today it houses the Pinacoteca Nazionale di Siena together with Palazzo Brigidi.

The palace houses the National Art Gallery of Siena, where you can see works by painters from the Sienese school spanning medieval centuries. The collection reflects how local artists developed their own style distinct from other Italian regions.

Palazzo Buonsignori stands on Via San Pietro, the street that runs south from Siena's centre towards Porta Romana, and shares its entrance with Palazzo Brigidi; the Pinacoteca Nazionale is housed in the two buildings together. Visitors enter from the street side, where the brick facade rises directly above the pavement.

The facade is topped by Guelph merlons, the swallowtail battlements of the pro-papal faction, and the stone base doubles as a bench along the street. The building was restored in the 19th century in a purist spirit, which shaped its present appearance.