Nowshahr (نوشهر; also Romanized as Now Shahr, Noshahr, and Nau Shahr; also known as Bandar-e Noshahr and the former name was Dehno) is a city in the Central District of Nowshahr County, Mazandaran province, Iran, and serves as both capital of the county and of the district. The largest ethnic group in Nowshahr is the Mazandarani people and they speak the Kojuri dialect of the language. They are also fluent in Persian, the official language of Iran. It is a port city on the southern coast of the Caspian Sea. Nowshahr was the center of Ruyan (Tabaristan).
At the 2006 National Census, its population was 40,578 in 11,550 households. The following census in 2011 counted 43,378 people in 12,695 households. The latest census in 2016 showed a population of 49,403 people in 16,287 households.
Nowshahr has a humid subtropical climate (Köppen: Cfa, Trewartha: Cf), with warm, humid summers and cool, damp winters.
With its humid, subtropical climate, sea bathing in the waters of the Caspian, and the natural environment of its mountains, Nowshahr has long been a destination for domestic tourism in Iran. It attracts visitors by the hundreds of thousands every year to its hotels and private villas, by virtue of its transport links with the other cities of Northern Iran. During the reign of Mohammad Reza Shah Pahlavi Nowshahr was known unofficially as the 'second capital' or 'summer capital' of Iran because it was the city in which the Shah and most high-level government officials chose to live and work during the summer months.
File:Amazing Fall In Nowshahr Jungle - panoramio (3).jpg|Tourists in July 2012
File:Sisangan Beach - panoramio.jpg|Sisangan Beach
File:Mole of Nowshahr.jpg|Mole of Nowshahr
File:Street in Nowshahr.jpg|Street in Nowshahr
File:Nowshahr Bazaar.jpg|Nowshahr Bazaar
File:باغ گیاهشناسی نوشهر، ورودی اصلی.jpg|National Botanical Garden of Iran
Mazanderani language
Nowshahr is part of kojur area and kojur is part of Ruyan.
Ruyan is a land in the west of Mazandaran Province, Iran. This land includes Kojur, Kalārestāq and Tonekabon.