Elasin Union () is a union of Delduar Upazila, Tangail District, Bangladesh. It is situated at 12 km south of Tangail.
According to Population Census 2011 performed by Bangladesh Bureau of Statistics, The total population of Elasin union is 27897. There are 6476 households in total.
The literacy rate of Elasin Union is 59.8% (Male-63.5%, Female-56.4%).