Nahāvand is a town in Hamadan Province in Iran. It is located in south of Hamadan, east of Malayer and shouthwest of Borujerd. Nahavand is one of the oldest existing cities of the modern Iran.
The city was founded by Darius I the Great, in Media along with the two other [[Achemenian] cities of Apamea and Xerxes. (Strabo xi. p. 524 ; Xerxes "Laodikeia") Pliny (vi. 29) describes it as being in the extreme limits of Media, and (re-)founded by XerxesI.
The city was a center of Chosroes I's empire. After military reverses (ca. 540) following his sack of Syrian Antiochia in 538, he was forced to rename his capital "Antiochia".
It is the site of the Battle of Nihawānd in 642 that completed the fall of the Sassanid Empire and the Islamic conquest of Iran.
Natives of Nahavand include Benjamin Nahawandi, who was a key figure in the development of Karaite Judaism in the Early Middle Ages, and 8th-century astronomer Ahmad Nahavandi, who worked at the Academy of Gundishapur.
Currently it had an estimated population of 77,206 in 2005.
Nahavand also gives its name to the musical mode (maqam) Nahwand in Arabic, Iranian and Turkish music.
it was found by Darius I the Great.