The ancient site at Kot Diji (Sindhi: ڪوٽ ڏیجي; Urdu: کوٹ ڈیجی) was the forerunner of the Indus Civilization. The occupation of this site is attested already at 3300 BCE. The remains consist of two parts; the citadel area on high ground (about 12 m [39 ft])), and outer area. The Pakistan Department of Archaeology excavated at Kot Diji in 1955 and 1957.

Located about 45 km (28 mi)) south of Khairpur in the province of Sindh, Pakistan, it is on the east bank of the Indus opposite Mohenjo-daro.

The site is situated at the foot of the Rohri Hills where a fort (Kot Diji Fort) was built around 1790 by the Talpur dynasty ruler of Upper Sindh, Mir Suhrab, who reigned from 1783 to 1830 AD. This fort built on the ridge of a steep narrow hill is well-preserved.