Constantin S. Nicolăescu-Plopșor or Nicolaescu-Plopșor (Romanian pronunciation: [konstanˈtin nikoləˈesku plopˈʃor]; April 20, 1900 – May 30, 1968) was a Romanian historian, archeologist, anthropologist and ethnographer, also known as a and folkorist and children's writer, whose diverse activities were primarily focused on his native region of Oltenia. Primarily interested in the Balkans' prehistoric period, he researched various Paleolithic, Mesolithic and Neolithic sites in his native country, placing them in a larger European context while producing his own systems of Prehistoric chronology and typology. His main contributions to archeology include the classification of Oltenian microliths, the study of local cave paintings, and the disputed claim that a site in Tetoiu evidenced a regional contribution to anthropogenesis.
Nicolăescu-Plopșor was also a politician and activist for the welfare of the Romani-Romanian minority, to which he belonged. Before World War II, he was one of the regional Oltenian leaders for the emerging Romani political movement, and a contributor to some of the first Romani-language newspapers in local history. His work in Romanian literature includes collections of Romanian folklore and Romani mythology, as well as original anecdotes and fairy tales with folkloric roots. An active collector of traditional items, he was also known for his activity as a museologist and head of the Museum of Oltenia in Craiova.