Udai Singh II (4 August 1522 – 28 February 1572)was the Maharana of Mewar and the founder of the city of Udaipur in the present-day Rajasthan state of India. He was the 12th ruler of the Mewar dynasty. He was the fourth son of Rana Sanga and Rani Karnavati, a princess of Bundi.
Udai Singh was born in Chittor in August 1522. After the death of his father, Rana Sanga, Ratan Singh II was crowned King. Ratan Singh II was assassinated in 1531. He was succeeded by his brother Maharana Vikramaditya Singh. During the reign of Vikramaditya, when the Muzaffarid Sultan of Gujarat Bahadur Shah sacked Chittor in 1534, Udai Singh was sent to Bundi for safety. In 1537, Banbir killed Vikramaditya and usurped the throne. He tried to kill Udai Singh also, but Udai's nurse Panna Dai sacrificed her own son Chandan to save him from his uncle Banbir and took him to Kumbhalgarh. She did not ask for anything in return either. She started living in Bundi and did not allow Udai Singh to come and meet her. He lived secretly in Kumbhalgarh for two years, disguised as a nephew of the governor Asha Shah Depura (Maheshwari).
In 1540, he was crowned in Kumbhalgarh by the nobles of Mewar. His eldest son Maharana Pratap from his first wife.
