Dehri also known as Dehri-on-Sone is a Nagar parishad and corresponding community development block in Rohtas district in the state of Bihar, India. Situated on the Son River, Dehri is a large industrial town and an important railway hub. As of 2011, its population was 137,231, in 23,234 households. Dehri is home to the Indrapuri Barrage, the fourth-longest barrage in the world.
In Swachh Survekshan 2020 Dehri On Sone (Dehri Dalmiangar Nagar Parishad) has been awarded as the cleanest city in Bihar. Dehri is well connected with Rail as well as Road by Major Indian Cities. National Highway 19 (India) passes through Dehri-on-Sone.