Hemnagar Union (Bengali: হেমনগর ইউনিয়ন) is a union of Gopalpur Upazila, Tangail District, Bangladesh. It is situated 52 kilometres (32 mi) north of Tangail.

The area is named for Hem Chandra Chowdhury, a zamindar who built his palace, Hemnagar Zamindar Bari, there in 1890.

According to the 2011 Bangladesh census, Hemnagar Union had 8,331 households and a population of 33,398. The literacy rate (age 7 and over) was 45.9% (male: 48.1%, female: 43.9%).

• Union Councils of Tangail District