Constantin Climescu (November 30, 1844 – August 6, 1926) was a Moldavian, later Romanian mathematician and politician.
Born in Bacau, he attended the princely academy in Ia?i, followed by the sciences faculty of Ia?i University.
He was a professor of analytic geometry and spherical trigonometry at Ia?i University from 1871 to 1909, served as dean of the sciences faculty from 1880 to 1901, and as rector of the university from 1901 to 1907.Meanwhile, from 1884 to 1896, he taught at the upper normal school of Ia?i, and was among the founders of Recrea?ii ?tiin?ifice periodical in 1883; its chief contributor, he wrote articles on arithmetic, elementary and analytical geometry, algebra and mathematical analysis.
He also belonged to the editorial board of Gazeta Matematica, where he wrote on the historiography of mathematics.
He wrote several textbooks that were widely used at the time, on algebra (1887), rational-number arithmetic (1890), elementary geometry (1891) and analytic geometry (1898); the last volume was the second of its type to appear in Romania.
He was elected a corresponding member of the Romanian Academy in 1892.A member of the National Liberal Party, he was elected to the Assembly of Deputies for Bacau in 1884, and represented Ia?i in the Senate from 1889 to 1910.
He was an officer of the Order of the Star of Romania, and a commander of the Order of the Crown.
He left the university when he reached the retirement age in 1909, died in 1926 and was buried in Eternitatea cemetery.