The Fourth Reich (German: Viertes Reich) is a theoretical future German empire, following the First Reich (The Holy Roman Empire, 962–1806), the Second Reich (Imperial Germany, 1871–1918), and the Third Reich (Nazi Germany, 1933–1945).
The term has been used in a variety of different ways. Some neo-Nazis have used it to describe their envisioned revival of Nazi Germany, while conspiracy theorists have used it to refer to what they perceive as a covert continuation of Nazi ideals. It has also been used by critics who believe that Germany exercises a dominant role in the European Union.
In terms of neo-Nazism, the Fourth Reich is envisioned as featuring Aryan supremacy, anti-Semitism, Lebensraum, aggressive militarism and totalitarianism. Upon the establishment of the Fourth Reich, German neo-Nazis propose that Germany should acquire nuclear weapons and use the threat of their use to re-expand to Germany's former boundaries as of 1937.
Based on pamphlets published by David Myatt in the early 1990s, many neo-Nazis came to believe that the rise of the Fourth Reich in Germany would pave the way for the establishment of the Western Imperium, a pan-Aryan world empire encompassing all land populated by predominantly European-descended peoples (i.e., Europe, Russia, Anglo-America, Australia, New Zealand, South Africa, Southern South America, and other significantly white countries in Latin America).
"Klemperer's best and most enduring book, apart from his diary, was LTI (short for lingua tertii imperii, "the language of the Third Reich"). So obvious were the parallels between Nazi and Communist propaganda and jargon that Klemperer had great difficulty with the publication of this subversive masterpiece. He started secretly collecting examples of "LTQ", the lingua quartii imperii ("language of the Fourth Reich") and his diaries record, with mounting cynicism, the cult of the personality that surrounded Stalin and the East German "Staliniculus", Walter Ulbricht." 
In his 2008 book, The Rise of the Fourth Reich: The Secret Societies That Threaten to Take Over America, Jim Marrs argues that some surviving members of Germany's Third Reich, along with sympathizers in the United States and elsewhere, given safe haven by organizations such as ODESSA and Die Spinne, have been working behind the scenes since the end of World War II to enact at least some of the principles of Nazism (e.g. militarism, fascism, conquest, widespread spying on citizens, use of corporations and propaganda to control national interests and ideas) into culture, government, and business worldwide, but primarily in the United States. He cites the influence of Nazis brought into the United States at the end of World War II, such as Nazi scientists brought in under Operation Paperclip to help advance aerospace in the U.S., and the acquisition and creation of conglomerates by Nazis and their sympathizers after the war, in both Europe and the United States.
German influence in the European Union
During the ongoing Eurozone Crisis, German Chancellor Angela Merkel has been accused of having pushed for Germany to have a greater say in the domestic governance of the eurozone’s 18 members, as part of a deal which saw Germany provide a significant part of the Euro Bailout program. Among other measures meant to reduce the likelihood of another Euro Crises, she has called for real European power over countries’ budgets. In Poland, Former Polish Prime Minister Jaroslaw Kaczynski has suggested in a book that "Germany wants to annex part of Poland".
British journalist Simon Heffer wrote in 2011 "Where Hitler failed by military means to conquer Europe, modern Germans are succeeding through trade and financial discipline. Welcome to the Fourth Reich."
- Schmidt, Michael The New Reich—Violent Extremism in Germany and Beyond 1993
- These writings of Myatt included the 14 pamphlets in his Thormynd Press National-Socialist Series, most of which were republished by Liberty Bell Publications (Reedy, Virginia) in the 1990's, and essays such as Towards Destiny: Creating a New National-Socialist Reich [archived at http://web.archive.org/web/20040712101315/http://www.geocities.com/myattns/newreich.html] and a constitution for the 'fourth Reich' [archived at http://web.archive.org/web/20041208070520/http://www.geocities.com/myattns/cons_reich.html]
- Goodrick-Clarke, Nicholas Black Sun: Aryan Cults, Esoteric Nazism, and The Politics of Identity New York: 2002--N.Y. University Press, See Chapters 4 and 11 for extensive information about the proposed "Western Imperium"
- Johnson, Daniel (28 September 2003). "A new life and a new tyranny - Daniel Johnson reviews The Lesser Evil: The Diaries of Victor Klemperer 1945-59 ed by Martin Chalmers". The Telegraph. Retrieved 23 July 2014.
- Spiegel Online: "Polish Opposition Leader: Kaczynski Warns of Germany's 'Imperial' Ambitions", 5 October 2011
- Heffer, Simon (17 August 2011). "Rise of the Fourth Reich, how Germany is using the financial crisis to conquer Europe". Daily Mail. Retrieved 28 August 2013.
- Infield, Glenn. Secrets of the SS (Stein and Day, New York, 1981) ISBN 0-8128-2790-2
- Schultz, Sigrid. Germany Will Try It Again (Reynal & Hitchcock, New York, 1944)
- Tetens, T.H. The New Germany and the Old Nazis (Random House, New York, 1961) LCN 61-7240
- Wechsberg, Joseph. The Murderers Among Us: The Simon Wiesenthal Memoirs (Mc Graw Hill, New York, 1967) LCN 67-13204
- Marrs, Jim (2008). The Rise of the Fourth Reich. New York: William Morrow. ISBN 9780061245589.