The Sewri Fort  is a fort in Mumbai built by the British at Sewri. Built in 1680, fort served as a watch tower, atop a quarried hill overlooking the Mumbai harbour.

Faced with relentless attacks by the Siddis in 1672, several fortifications were constructed in Mumbai, and in 1780 the Sewri fort was complete. It stood on the island of Parel, on a hill overlooking the eastern seaboard and Indian mainland. It had a garrison of 50 sepoys and was managed by a subedar. It was also armed with eight to ten cannons.

In 1689, the Siddi general, Yadi Sakat, with an army of 20,000 men, invaded Mumbai. The fleet first captured the Sewri fort, then the Mazagon Fort, before sacking the town of Mahim. The fort was also later involved in a battle that repelled a Portuguese attack in 1772.