Hugo Berthold Heinrich Duensing (15 April 1877–28 November 1961) was a German scholar of early Christianity and a Lutheran pastor.
He specialized in Eastern Christianity and oriental studies, including documents in Ethiopian; Syriac and Aramaic; and Arabic.
Hugo Duensing was born in Hanover, then part of the German Empire, on 15 April 1877 to his parents Friedrich and Henriette.
He was ordained a pastor in 1907, and served from 1907 to 1909 in Bad Rehburg; from 1909 to 1926 in Dassensen [de]-Wellersen; and from 1926 until his retirement in 1947 in Goslar at the Market Church St. Cosmas and Damian.
Duensing suffered from occasional spates of ill health and exhaustion, and committed himself to a sanitarium for rest in 1905, 1914, 1920, 1928, and 1936.