Udai Singh Rathore (13 January 1538 – 10 July 1595), also known by the sobriquet Mota Raja (the fat king), was the Rathore ruler (reigned 1583–95) of Marwar, which was later known as Jodhpur (in the present-day Rajasthan state of India). He was also the maternal grandfather of Shah Jahan, the fifth Mughal Emperor, and an ancestor of all subsequent emperors.