Konstantinos A. Plevris (; born 1939 in Athens), sometimes called in English Constantine Plevris or Kostas Plevris, is a Greek politician, lawyer and author. The prolific writer has, over the course of decades, written a number of books and other texts relating to Greek history, Greek culture, sociology, and politics, with a clear nationalist, homophobic (such as his book titled ""Οι Κίναιδοι"", a vehement polemic against homosexuals) content. In his book "The Jews: The Whole Truth", he described himself as a "Nazi, fascist, racist, anti-democrat, anti-Semite". He was the founder and leader of the Metaxist 4th of August Party and Front Line, with the former political party not only playing a significant role in influencing and shaping the future direction of the Greek extreme right but also being itself as a prominent political movement before the junta in general. He has also co-operated (according to interviews he gave to various publications, including one to Italian magazine "L'Europeo" in 1976, which were quoted and accepted as proof in a court of law in which he was the plaintiff against the author Nikos Kleitsikas) with various European neo-fascist groups (including the Ordine Nuovo), and figures such as Pino Rauti, Pino Romualdi, Giorgio Almirante, and others of the same ilk. He later briefly joined the right-wing party Popular Orthodox Rally and was its leading candidate in the 2004 elections. He is thw father of Thanos Plevris, member of the Greek parliament formerly with the Popular Orthodox Rally party, now with New Democracy.