| Nain | |
| Native Name: | Persian: نائین |
| Native Name Lang: | fa |
| Settlement Type: | City |
| Pushpin Map: | Iran |
| Coordinates Footnotes: | [1] |
| Subdivision Type: | Country |
| Subdivision Name: | Iran |
| Subdivision Type1: | Province |
| Subdivision Name1: | Isfahan |
| Subdivision Type2: | County |
| Subdivision Name2: | Nain |
| Subdivision Type3: | District |
| Subdivision Name3: | Central |
| Unit Pref: | Metric |
| Population As Of: | 2016 |
| Population Total: | 27379 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
Nain (Persian: نائین) is a city in the Central District of Nain County, Isfahan province, Iran, serving as capital of both the county and the district.[2]
The history of Nain appears to go back to pre-Islamic times, but no information about it has survived. It is famous for its big castle and its congregational mosque, the Jameh Mosque of Nain. It was described by medieval historians to have been in the sardsīr ("cooler highland areas"), and being a subordinate to either Yazd or Isfahan, despite being part of the administration of the Fars province.
The historian and geographer Hamdallah Mustawfi reported that the walls of Nain's castle, which are still present as mud brick remnants, were four thousand paces long. The nearby mountains' silver mines are also described by the geographers. During the Safavid era, the kaolinite of Nain was utilized to manufacture porcelain at the city of Kashan.
Under the Buyid dynasty (934–1062), the Jameh Mosque of Nain was constructed.
The following graph depicts the language composition of the city. Naini is a Central Plateau language[3] which is part of the Northwestern Iranian languages.
At the time of the 2006 National Census, the city's population was 24,424 in 6,954 households.[4] The following census in 2011 counted 25,379 people in 7,730 households.[5] The 2016 census measured the population of the city as 27,379 people in 8,906 households.[6]