Ratnasimha or Ratan Singh was a ruler of the Medapata (Mewar) kingdom in present-day Rajasthan, India.
He belonged to the Rawal branch of the Guhila dynasty, which ruled from the Chitrakuta fort.
Ratnasimha succeeded his father Samarasimha as the Guhila ruler of Mewar around 1302 CE.
Ratan Singh was the last ruler of the Rawal branch of the Guhila dynasty.
Alauddin attacked Chittorgarh to obtain his beautiful wife Rani Padmini; Alauddin captured the fort after Ratan Sen died in combat with king Devpal of Kumbhalner; subsequently, Padmini and other women committed Jauhar to protect their honor.
In 1303, Alauddin Khalji, the Muslim ruler of the Delhi Sultanate, invaded Chittor.