Encyclopedia Dramatica (ED or æ; stylized as Encyclopædia Dramatica) is an online community website, centered around a wiki, that acts as a "troll archive" and its community members frequently participate in harassment campaigns. The site hosts racist material and shock content; as a result it was filtered from Google Search in 2010. The website's articles parody topics and current events related or relevant to contemporary internet culture in an encyclopedic fashion. It also serves as a repository of information and a means of discussion for the hacker group known as Anonymous. Encyclopedia Dramatica celebrates its subversive "NSFW" "troll site culture" and documents internet memes, events such as mass organized pranks, trolling events called "raids", large-scale failures of internet security, and criticism by those within its subculture of other internet communities which are accused of self-censorship in order to garner positive coverage from traditional and established media outlets. The site hosts numerous pornographic images, along with content that is misogynistic, racist, antisemitic, Islamophobic and homophobic.

On April 14, 2011, the original URL of the site was redirected to a new website named "Oh Internet" that bore little resemblance to Encyclopedia Dramatica. Parts of the ED community harshly criticized the changes. On the night of the Encyclopedia Dramatica shutdown, regular ED visitors bombarded the 'Oh Internet' Facebook wall with hate messages. The Web Ecology Project published a downloadable archive of Encyclopedia Dramatica's content the next day. Besides this archive, fan-made torrents and several mirrors of the original site were subsequently generated. Based on these archives, the site has repeatedly gone offline and come back under new domain names. Between 2013 and 2024, the website was hosted under various top level domains: .rs, .ch, .es, .se, .wiki, .online, .top, .win and .gay. As of May 2025, the only active mirror of ED is edramatica.com.