Dadri is situated near Gautam Budh Nagar in Uttar Pradesh. They city made a significant contribution towards the struggle for the freedom of the country in 1857. Its ruler Raja Umrao Singh, a Gurjar and some other Gurjar chieftains of the region, revolted against the British government. He along with his four associates was hanged by the British forces.
The city is also known for a power generation plant run by the National Thermal Power Corporation.