Mokna Union () is a union of Nagarpur Upazila, Tangail District, Bangladesh. It is situated 12 km east of Nagarpur and 36 km southeast of Tangail city.
According to the Population Census of 2011 performed by Bangladesh Bureau of Statistics, the total population of the Mokna union is 22,040 and there are 5,246 households in total.
The literacy rate of Mokna Union is 42.4% (Male-46%, Female-39.3%).