Kot Diji (Sindhi: ڪوٽ ڏیجي; Urdu: کوٹ ڈیجی) is an ancient site which was part of the Indus Valley Civilization, estimated to have been occupied around 3300 BCE.

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

[2] The site is situated at the foot of the Rohri Hills, where Kot Diji Fort was built around 1790 by the Talpur dynasty ruler of the Upper Sindh, Mir Suhrab, who reigned from 1783 to 1830 AD.

Rehman Dheri also has a pre Kot Diji phase (RHD1 3300-28 BCE) which are not part of IVC culture.

Lithic material, such as leaf-shaped chert arrowheads, shows parallels with Mundigak layers II-IV.

There is a citadel on high ground for the elites separated by a defensive wall with bastions at regular intervals.

Pottery found from this site has designs with horizontal and wavy lines, or loops and simple triangular patterns.

Other objects found are pots, pans, storage jars, toy carts, balls, bangles, beads, terracotta figurines of mother goddess and animals, bronze arrowheads, and well-fashioned stone implements.

Red slip and black painted designs replaced polychrome decorations of the Ravi Phase.

The present note, without positively solving the much debated issue of the age of the fort, points to a new line of research on the topic, which deserves future work, in order to collect more organic material for absolute dating.

An Acacia charcoal sample collected from the above exposed surface was sent to Groningen Radiocarbon Laboratory (NL) for AMS dating.