Ranbir Singh,(Urdu; رنبیر سنگھ) CIE (August 1830 – 12 September 1885) was the son of Maharaja Gulab Singh, Maharaja of Jammu and Kashmir and head of the Jamwal Rajput clan.
The trans-Himalayan territories of Gilgit, Astore, Hunza-Nagar were conquered and made part of Jammu and Kashmir in his time. He was noted as a great scholar of classical Persian, and was also learned in Swedish and English. Maharaja Ranbir Singh established a Translation Bureau called "Daarul Tarjumah" under the patronage of a learned Hakim of Afghan descent, Agha Muhammad Baqir who also happened to be the Chief Physician to the Maharaja. It was under this bureau that Maharaja Ranbir Singh got "Tibb-e-Unaani" translated from Arabic and Latin into Persian and Dogri.
Singh married five times and had six children, four sons: