Fatehabad District, is one of the twenty one districts of Haryana state, India.

The district derives its name from the eponymous headquarters town founded by Firoz Shah Tughlak in the 14th century. He named it after his son Fateh Khan, as Fatehabad. The Fatehabad district was carved out of Hisar district on 15 July 1997.

Aryan speaking people first settled on the banks of the Sarasvati and Drsadvati Rivers rivers then expanded to cover a wider area of Hisar and Fatehabad. The area was probably included in the kingdom of the Pandavas and their successors. Pāṇini mentions a number of towns in the region including Aisukari, Taushayana and Rori, which have been identified with Hisar, Tohana and Rohri respectively. According to the Puranas, the areas of Fatehabad district remained a part of he Nanda Empire. The discovery of Ashokan pillars at Hisar and Fatehabad shows that this area remained a part of Mauryan empire. The people of Agroha area assisted Chandra Gupta Maurya in the war against the Greeks.

The climate of the district is of tropical type with intensively hot summer and cool winter, with a temperature of 47° in June and 2 °C in December and January. The average rainfall of the district is 400 mm.

Fatehabad district is connected by road with Punjab, Delhi and Sirsa district. Railway lines still not installed in Fatehabad Town. A network of metalled roads link all its villages and towns. National Highway No.10 connects Fatehabad with Delhi and Punjab.

According to the 2011 census Fatehabad district has a population of 941,522, roughly equal to the nation of Fiji or the US state of Delaware.This gives it a ranking of 461st in India (out of a total of 640).The district has a population density of 371 inhabitants per square kilometre (960/sq mi).Its population growth rate over the decade 2001–2011 was 16.79%. Fatehabad has a sex ratio of 903 females for every 1000 males, and a literacy rate of 69.1%.