Nain may refer to:

• Nain , an Iranian city.
• Nain, a village on the central coast of Labrador, part of the Canadian province of Newfoundland, sometimes also referred to as Natuk , its Inuit name.
• Nain (English: Naein), name of a traditional pattern and design of Persian carpet, based on the city of Nain , where it is mainly produced
• Náin, name of two fictional kings from Middle-earth, Náin I and Náin II