Hassa is a municipality and district of Hatay Province, Turkey. Its area is 520 km2, and its population is 56,675 (2022). It is on the eastern side of the Nur (Amanos) Mountains, looking towards the city of Gaziantep. It is on the Antakya-Malatya road. In the late 19th and early 20th century, Hassa was part of the Adana Vilayet of the Ottoman Empire. Its population was predominantly Turkoman. Hassa was a district in Cebel-i Bereket Province from 1923 to 1933 and then a part of Gaziantep Province until 1939.