Metapedia is an online wiki-based encyclopedia which spreads neo-Nazi content.

The Swedish Metapedia was founded in 2006 by Anders Lagerström [sv], a neo-Nazi publisher from Linköping, Sweden. About Lagerström, the Swedish newspaper Östgöta Correspondenten wrote:

Anders Lagerström has long been involved in extreme right-wing organizations. In 2000, he was convicted of spraying tear gas in the face of a police officer. In 2002 he started the Nordic publishing house, which specializes in issuing and selling Nazi literature and white power music. Lagerström is also a prominent figure in the Nordic Federation [sv]. The Nazi organization seems to be creating a "Nordic nation state". The organization's website says the following about how this imaginary nation should look: "It means a society populated by a people, and a state power and mass media entirely under Nordic control."

Swedish historian Rasmus Fleischer wrote:

In 2007, another network began to crystallize within Europe's radical right but with a vastly different ideological character. Activists from the Swedish group Nordiska Förbundet made a coordinated effort to use the internet to propagate a more 'positive' image of neo fascist [sic], third position and national revolutionary politics. They created a blog portal (Motpol.nu), a web community (Nordisk.nu) and a wiki site (Metapedia). Today there exist a dozen editions of Metapedia, making it a vital medium for dissemination of the ideology labeled here as "multi-fascism". Metapedia tends to promote antisemitism in a cautious way, not stating too much in words but instead using the hyperlinked wiki format to make insinuations about a Jewish conspiracy.

Metapedia describes itself as being an alternative to Wikipedia that focuses on culture, art, science, history, politics and philosophy. The site has more than 4,500 articles in English; topics covered include European history and politics. According to Crítica de la Argentina, Metapedia has glowing descriptions of Adolf Hitler and other Nazi figures. The historian Daniel Goldhagen describes it as seeking "to create (currently in 18 languages) an anti-Semitic informational universe." Metapedia calls the Holocaust a genocide only according to "politically correct history" and refers to former U.S. President Barack Obama as a "mixed race former president". Its content has been noted for its neo-Nazi points of view.

The wiki covers a total of 17 languages, with German Metapedia being the most developed.

According to the North Rhine-Westphalian Office for the Protection of the Constitution, Metapedia's articles are characterized by historical negationism and lauding Nazi Germany. For this reason, the German Federal Department for Media Harmful to Young Persons (Bundesprüfstelle für jugendgefährdende Medien) started an indexing process, which would consider as to whether Metapedia is "harmful to young people".^{[needs update]}