Kanwar Sain, also spelt as Rai Bahadur Kanwar Sain Gupta OBE (1899–1979) was a civil engineer from Haryana state in India. He was the chief engineer in the Bikaner state who came up with idea of Rajasthan Canal. He also successfully implemented Ganga canal project. He was considered a dynamite of irrigation engineering of his time.
He was born in 1899 in Tohana district Fatehabad (Haryana). He was educated at D.A.V. College, Lahore. He graduated as a civil engineer from Thomason College of Civil Engineering, Roorkee (now, IIT Roorkee) in the year 1927 with hons. He was awarded Padma Bhushan in 1956. He has written a book called -Reminiscences of an engineer.
He was chairman of Central Water and Power Commission, Ministry of Irrigation and Power, Government of India.
Kanwar sain and Karpov (1967) presented enveloping curves for Indian rivers.
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