Nain may refer to:
- Nain rug, name of a traditional pattern and design of Persian carpet
- North American Interfaith Network
- Nain, assistant court ladies of Korea
- Places
- Nain, Iran, a city in Iran
- Nain County, an administrative subdivision of Iran
- Nain, Israel, a village in Galilee, mentioned in the New Testament (Young man from Nain) in Luke
- Nain, Jamaica, a village in the parish of Saint Elizabeth
- Nain, Newfoundland and Labrador, a village on the central coast of Labrador, Canada
- Nain, Punjab, a village and Union Council of Pakistan
- Nain, Virginia, an unincorporated community in Frederick County, Virginia, United States
- Nain, Principality of Hutt River, capital and only town in the Australian micronation
- Names
- Náin, a dwarf of Norse mythology
- Náin, name of three Dwarves from J. R. R. Tolkien's writings: Náin I, Náin II and Náin, son of Grór
- Nain, surname of Jat caste in India
- Nain, the name for a grandmother in the Welsh language