Ranikot Fort is a historical fort in Sindh, Pakistan. Ranikot Fort is also known as The Great Wall of Sindh and is believed to be the world's largest fort with a circumference of approximately 32 kilometres (20 mi).

The fort's ramparts have been compared to the Great Wall of China. The site was nominated in 1993 by the Pakistan National Commission for UNESCO world heritage status, and has since been on the tentative list of UNESCO World Heritage Sites.

The fort is listed as a historical site and it’s under protection. Ranikot Fort is 90 kilometres (56 mi) to the north of Hyderabad on the national highway. There is also an easy access of about an hour's journey from Karachi to Sann on the Indus Highway.

The original purpose and architects of Ranikot Fort are unknown, however, it is believed that the fort was built during the regimes of the Sassanians, the Scythians, the Parthians or the Bactrian Greeks.

Archaeologists point to the 17th century as the time of its first construction but Sindh archaeologists now agree that some of the present structures were reconstructed by Talpurs in 1812 at a cost of 1.2 million rupees (Sindh Gazetteer, 677).

The fort is huge, connecting several bleak mountains of the Kirthar hills along contours, and measures 31 kilometres (19 mi) in length. The fort is interspersed with several bastions in between and three are of semi-circular shape.