Constantin D. Nicolescu (October 5, 1887 – 1972) was a Romanian career army officer. Born in Bucharest, he served as a second lieutenant during the Second Balkan War in 1913. During World War I, he was a captain in a cavalry regiment, and was decorated with the Order of Michael the Brave and the Legion of Honour. From 1925 to 1927, he served as military attaché in Paris. In 1929, with the rank of colonel, he began commanding the royal escort regiment. Made a general in 1939, he entered the Defense Ministry as general secretary. In May 1940, he advanced to ministerial rank in the cabinet of Gheorghe Tătărăscu, holding office as undersecretary of state. Then, from July 4 to September 4, he was Defense Minister in the cabinet of Ion Gigurtu, and was elevated to the rank of division general. I