Sindri is an industrial township within the Dhanbad municipal limits of the Dhanbad District of Jharkhand state in India. The name originates from “Sindoori” or vermillion-colored. The soil in the area is laterite and has a Vermillion/reddish hue. That gave the location its name.

Sindri was well-known because of a large Fertilizer factory (Fertilizer Corporation of India Limited – FCI, closed in 2002) conceived here in early industrialized India. It was also known for few other companies situated here such as ACC Limited (formerly Associated Cement Company Limited), Coal Mines of The Indian Iron and Steel Company Limited (IISCo), which has been taken over by Steel Authority of India Limited (SAIL) and Projects and Development India Limited (PDIL), formerly Planning & Development Division of FCI and Coal Mines of the Bharat Coking Coal Limited, a subsidiary company of Coal India Limited.

Another subject of topographical importance is the Damodar river which acted both as a source of water and electricity for the township. A hydropower project called Damodar Valley Corporation (DVC) is located at Maithon and Panchet near Sindri. DVC supplies eco-friendly electricity to some of its neighboring states like West Bengal, Bihar, and Odisha. It is also well-known for the BIT Sindri which was earlier known as Bihar Institute of Technology later on its abbreviation changed to Birsa Institute of Technology when the state is transformed from Bihar to Jharkhand.

Work has begun on a plan to revive Sindri again. To revive the fertilizer factory, Hindustan Fertilizer and Chemicals Limited i.e HURL, has started preparatory work. As soon as the construction work of the factory is completed, so will the shape of the surrounding areas. As per HURL, about 132 acres of the surrounding area are to be converted into a green belt.

This city is connected by road and rail to the district headquarter of Dhanbad. There is a train service between the city and Dhanbad. There are three small rail stations in Sindri, the Sindri Town station, Sindri Marshalling Yard, and Sindri. The rail line connects the city (via Dhanbad) to the regional industrial city of Jamshedpur with the most important train through Sindri being the Subarnarekha Express.