Dalmianagar
| Dalmianagar | |
|---|---|
| Town | |
| Coordinates: 24°53′N 84°09′E / 24.883°N 84.150°E | |
| Country | India | 
| State | Bihar | 
| District | Rohtas | 
| Elevation | 67 m (220 ft) | 
| Population  (2001) | |
|  • Total | 29,962 | 
| Languages | |
| • Main | Bhojpuri | 
| Time zone | UTC+5:30 (IST) | 
| PIN | 821305 | 
| Telephone code | 06184 | 
| Lok Sabha constituency | Karakat | 
| Vidhan Sabha constituency | Dehri-on-Sone | 
Dalmianagar is a town that had one of the oldest and biggest industry in India. It is situated at Dehri-on-Sone on the banks of the Sone River in Rohtas district of Bihar. This is a city and a Municipality in Rohtas district in the state of Bihar, India, combinedly known as Dehri-Dalmianagar Nagar Palika.