Surajkund hot spring (also called Surya Kund) is a natural hot spring in Belkapi gram panchayat of Barkatha CD block in Barhi subdivision of Hazaribagh district in the Indian state of Jharkhand.

Surajkund has a hot water spring containing sulfur that has healing properties.

Tourism department of Jharkhand Government has planned to set up spas, saunas, massage parlours, restaurants and convention halls here,[4] Surajkund hot spring is claimed to be the hottest spring in India.

According to recent assessment, India has a large potential of geothermal energy, which can be gainfully utilized for power generation; Jharkhand possesses a good share of these.

Other prospective sites in Jharkhand are: Tantolaya / Tantlol, in Santhal Paragana division, and Thatha / Konraha and Jarom in Palamu district.