The Inquisitor's Palace (Maltese: Il-Palazz tal-Inkwiżitur, colloquially tal-Inkisitur) is a palace in Birgu, Malta. It was the seat of the Maltese Inquisition from 1574 to 1798, under the name Palazzo del Sant'Officio. The building was originally constructed as a courthouse known as the Castellania in the early 16th century, but little remains of the original building due to major alterations and renovations carried out in the subsequent centuries.