Un is a town and a nagar panchayat in Shamli district in the Indian state of Uttar Pradesh.
Un is located at . It has an average elevation of 240 metres (787 feet).
As of the 2011 Census of India, Un had a population of 15,124. Males constitute 55% of the population and females 45%. Un has an average literacy rate of 58%, lower than the national average of 59.5%: male literacy is 69%, and female literacy is 45%. In Un, 15% of the population is under 6 years of age.