Bombay Castle, Fort in Mumbai, India

Bombay Castle, also called Casa da Orta, stands in the Fort district of Mumbai on the site of a manor leased by Garcia de Orta. It was built of local blue Kurla stone and red laterite from the Konkan region, with four bastions, two surviving gates and a Portuguese-era sundial. The main building, the Governor's House, now holds the offices of the Flag Officer Commanding-in-Chief Western Naval Command.

Garcia de Orta leased Bombay from the King of Portugal between 1554 and 1570 and built a manor house on the site. The English took the islands in 1665, and the East India Company acquired the castle in 1668, then spent about ten years adding defences around the manor. A wall raised around the new town was demolished in 1865 as the city grew, though fragments survive.

The castle's name alternates with Casa da Orta, after Garcia de Orta, the Portuguese nobleman who leased Bombay island from the King of Portugal between 1554 and 1570 and built a manor here. Two gates of that manor now stand within INS Angre naval station in South Mumbai, and a sundial attributed to the Portuguese period marks selected periods of the day rather than the twelve hours.

The castle grounds lie within INS Angre, a naval station in South Mumbai, and the main building houses the offices of the Flag Officer Commanding-in-Chief Western Naval Command. Two Portuguese-era gates and a sundial stand inside the station, so expect military security checks and restricted movement rather than open tourist visiting.

Originally, three of the four bastions were completely surrounded by water, including the Flagstaff, Flower Tree, and Tank fortifications. This water barrier provided extra defense but also made the structure dependent on tidal conditions for protection.