Maharaja Sir Sardar Singh Bahadur GCSI (11 February 1880 – 21 March 1911) was the Maharaja of Jodhpur State (historically known as the Kingdom of Marwar) from 11 October 1895 till his death. He succeeded his father Maharaja Sir Jaswant Singh II in 1895. He reigned under the Regency of his uncle until he came of age and was invested with full ruling powers, at Mehrangarh, Jodhpur, on 18th February 1898. He was created KCSI (Knight Commander) in 1908 and GCSI (Knight Grand Commander) in 1910. He was a noted polo player. He died on 21 March 1911 and was succeeded by his son Sumer Singh.