Kumar Shri Duleepsinhji (13 June 1905 – 5 December 1959), often known as Duleep or K. S. Duleepsinhji, was an Indian international cricketer who represented the English cricket team. He was a right handed batsman and an occasional leg break bowler. Playing in the era before the Indian Independence and the establishment of the Indian cricket team, he played first class cricket in the United Kingdom and later represented the England team.

Descended from the royal family of Nawanagar, (present day Jamnagar), Duleepsinhji was born on the Kathiawar peninsula in present-day Gujarat. He was educated in Rajkot, before moving to England where he attended Cheltenham College and Cambridge University. He represented Sussex in the English county championship, whom he captained later. He was one of the most prolific scorers in first class cricket with more than 15,000 runs including 50 centuries at an average just below 50. He was a slip fielder and took 256 catches. Though he had a short test career, he scored 995 runs at an average of 58.52 and has one of the highest averages in the history of test cricket.

Post his cricketing career, Duleepsinhji served as the High Commissioner of India in Australia and New Zealand and later as the chairman of the Public Service Commission in Saurashtra. The Duleep Trophy, one of the premier first class cricket competitions in India is named after him.

Duleepsinhji was born on 13 June 1905 in Nawanagar, (present day Jamnagar), Kathiawar, British India (present day Gujarat, India). He was from the royal family of Nawanagar state and his siblings included Himmatsinhji, the first Lieutenant-Governor of Himachal Pradesh and Digvijaysinhji, who became the ruler of Nawanagar. Ranjitsinhji, after whom the Indian premier first class cricket competition Ranji Trophy is named, was his uncle. He was educated at the Rajkumar College, Rajkot, before moving to England where he attended Cheltenham College and Cambridge University.

Duleepsinhji represented Cheltenham Cricket Club from 1921 to 1923 and captained the side later. He had a batting average of 52.36 with his highest score being 162 and took 50 wickets at an average of 13.66 runs with his leg breaks. In 1925, he moved to study in Cambridge University and represented the Cambridge University Cricket Club till 1928. In 1927, he scored his highest score of 254 against Middlesex which was the highest for Cambridge.

Duleepsinhji made his first class debut for Sussex in 1926. He did not play the 1927 English cricket season due to suffering from a pulmonary disease and recuperated in Switzerland.

In natural gifts of eye, wrist and footwork he is certainly far above the ordinary measure... there is no doubt about the judgment and certainty with which he takes toll of straight balls of anything but the most immaculate length. His late cutting is quite beautiful and there is a certain ease and maturity about all his batting methods that stamps him as of a different class from the ordinary school batsman.

He returned to play for Sussex in 1928 and scored more than 2500 runs in each of the next three seasons. In the 1930 English cricket season, he made his top score of 333 runs on a single day against Northamptonshire which is the highest score by a Sussex batter till date. He scored centuries in each of the two innings three times in his career.