Nahavand () is a city in Hamadan Province, Iran. It is the capital of Nahavand County. At the time of the 2006 census, its population was 72,218, in 19,419 families. It is located south of the city of Hamadan, west of Malayer and northwest of Borujerd. Inhabited continuously since prehistoric times, Nahavand was bestowed upon the House of Karen in the Sasanian period. During the Arab Muslim conquest of Persia, it was the site of the famous Battle of Nahavand.