Constantin Dimitrescu-Iași (November 25, 1849–April 16, 1923) was a Moldavian, later Romanian philosopher, sociologist and pedagogue.
Born in Iași, his father was the magistrate Dimitrie Dimitrescu. He attended primary school in his native city from 1856 to 1860, followed by high school from 1860 to 1867. His classmates there included Alexandru Lambrior, George Panu and Calistrat Hogaș. From 1867 to 1869, he attended the literature and philosophy faculty of Iași University, and at the same time worked as a substitute Latin teacher. From 1869 to 1870, Dimitrescu-Iași taught at Botoșani. He again taught at Iași from 1870 to 1872, continuing his university studies in the process. From 1872 to 1875, he was a teacher in Bârlad. He then went to Germany to study at the universities of Berlin (1875-1876) and Leipzig (1876-1877). From 1879 to 1885, he taught aesthetics, history of philosophy, logic, psychology and pedagogy at Iași University.
In 1885, Dimitrescu-Iași transferred to Bucharest University, where he taught history of ancient and modern philosophy, ethics and aesthetics until his retirement in 1919. An inspector general with the Education Minister, he was also director of the Iași higher normal school, of the Bucharest University Library (1898-1910) and of the pedagogic seminary run by the university (1899-1919). He served as rector of Bucharest University for twelve years, from October 1898 to January 1911. Although he joined Junimea in 1878, Dimitrescu-Iași did not endorse its political orientation, indeed condemning its positions in a series of articles that appeared in Drapelul and Democrația from 1897 to 1898. Dimitrescu-Iași led Revista pedagogică magazine from 1891 to 1898 and was quite familiar with the principles of modern pedagogy. A close associate of Spiru Haret, he made a substantial contribution to the 1898 law for the reform of secondary and higher education. He died in Turnu Severin.