Deosar (Devsar) is a town and tehsil in Singrauli district, Madhya Pradesh, India.

It is also a Madhya Pradesh Legislative Assembly, part of the Sidhi Lok Sabha constituency.

Previously it was a part of Singrauli State which was ruled by the Venvanshi Maharajas.

Sidhi, Singrauli, Rewa, Renukoot are the nearby cities to Deosar.

It is at an elevation of 394 m. Vindhyachal, Rewa, mada caves, Allahabad, Varanasi (Benares) are the nearby important tourist destinations.