Duptiair Union () is a union of Nagarpur Upazila, Tangail District, Bangladesh. It is situated 12 km south of Nagarpur and 36 km south of Tangail city.
According to Population Census 2011 performed by Bangladesh Bureau of Statistics, The total population of Duptiair union is 26,336. There are 5,677 households in total.
The literacy rate of Duptiair Union is 35.6% (Male-41.4%, Female-30.1%).