Giuseppe Bonici (1707–1779) was a Maltese architect and military engineer. He held the post of Capomastro delle Opere della Religione and was the principal architect of the Order of St. John from 1761 until his death. He designed several notable buildings; his masterpiece was the Customs House in Valletta.

The Castellania, also known as the Castellania Palace, is a former courthouse and prison in Valletta, Malta that currently houses the country's health ministry. It was built by the Order of St. John between 1757 and 1760, on the site of an earlier courthouse which had been built in 1572.