Nicolae Iorga (Romanian pronunciation: [nikoˈla.e ˈjorɡa]; sometimes Neculai Iorga, Nicolas Jorga, Nicolai Jorga or Nicola Jorga, born Nicu N. Iorga; 17 January 1871 – 27 November 1940) was a Romanian historian, politician, literary critic, memoirist, Albanologist, poet and playwright. Co-founder (in 1910) of the Democratic Nationalist Party (PND), he served as a member of Parliament, President of the Deputies' Assembly and Senate, cabinet minister and briefly (1931–32) as Prime Minister. A child prodigy, polymath and polyglot, Iorga produced an unusually large body of scholarly works, establishing his international reputation as a medievalist, Byzantinist, Latinist, Slavist, art historian and philosopher of history. Holding teaching positions at the University of Bucharest, the University of Paris and several other academic institutions, Iorga was founder of the International Congress of Byzantine Studies and the Institute of South-East European Studies (ISSEE). His activity also included the transformation of Vălenii de Munte town into a cultural and academic center.

In parallel with his academic contributions, Nicolae Iorga was a prominent right-of-centre activist, whose political theory bridged conservatism, Romanian nationalism, and agrarianism. From Marxist beginnings, he switched sides and became a maverick disciple of the Junimea movement. Iorga later became a leadership figure at Sămănătorul, the influential literary magazine with populist leanings, and militated within the League for the Cultural Unity of All Romanians, founding vocally conservative publications such as Neamul Românesc, Drum Drept, Cuget Clar and Floarea Darurilor. His support for the cause of ethnic Romanians in Austria-Hungary made him a prominent figure in the pro-Entente camp by the time of World War I, and ensured him a special political role during the interwar existence of Greater Romania. Initiator of large-scale campaigns to defend Romanian culture in front of perceived threats, Iorga sparked most controversy with his antisemitic rhetoric, and was for long an associate of the far-right ideologue A. C. Cuza. He was an adversary of the dominant National Liberals, later involved with the opposition Romanian National Party.

Later in his life, Iorga opposed the radically fascist Iron Guard, and, after much oscillation, came to endorse its rival King Carol II. Involved in a personal dispute with the Guard's leader Corneliu Zelea Codreanu, and indirectly contributing to his killing, Iorga was also a prominent figure in Carol's corporatist and authoritarian party, the National Renaissance Front. He remained an independent voice of opposition after the Guard inaugurated its own National Legionary dictatorship, but was ultimately assassinated by a Guardist commando.