Hanwant Singh I of Marwar was the last ruler of the third largest Indian Kingdom of Marwar. He succeeded his father as the Maharaja of Jodhpur of the Rathore dynasty of Marwar on 9 June 1947 and held the title till his death at a young age in a plane crash on 26 January 1952.

Marwar is a region of western Rajasthan state in North Western India. It lies partly in the Thar Desert. The word 'maru' is Sanskrit for desert. In Rajasthani languages, "wad" means a protected area. English translation of the word 'marwar' is the region protected by desert.