Chignolo Po Castle, Medieval castle in Chignolo Po, Italy.

Chignolo Po Castle is a castle in the province of Pavia, Lombardy, originally built as a fortification and later transformed into a noble residence. The complex groups a central tower, inner courtyards, large halls, old kitchens, and wine cellars, all built in stone.

The central tower dates to the early medieval period, when this part of the Po valley needed to be defended. Over the following centuries, noble families took over the site and turned it from a purely defensive post into a stately home.

Cardinal Agostino Cusani Visconti, papal ambassador to Venice and to the court of Louis XIV, funded the 1700–1730 rebuilding, and the castle became known as the Versailles of Lombardy. Its guest rooms include the apartment of Pope Clement XI and the bedroom where Napoleon Bonaparte and Emperor Francis I of Habsburg slept. The reception rooms hold stuccoes and paintings by artists of the Tiepolo school.

The castle sits in the center of Chignolo Po and is easiest to reach by car, as public transport in the area is infrequent. Wear comfortable shoes, since the paths and stairs inside are made of stone.

Behind the main building lies a park with fountains and ornamental gardens laid out in the 18th century, which many visitors walk past without stopping. Spending time there gives the visit a very different feel from the stone interiors of the castle itself.