Fort Bassein is a ruined fort of the town of Vasai (Bassein), Maharashtra, India. The structure was formally christened as the Fort of St. Sebastian in the Indo-Portuguese era. The fort is a monument of national importance and is protected by the Archaeological Survey of India.
The fort and the town are accessible via the Naigaon Railway Station which itself is in the city of Vasai-Virar, and lies to the immediate north of the city of Mumbai. The Naigaon Railway Station is on the Western Railway line (formerly the Bombay-Baroda railway) in the direction of the Virar railway station.
