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 whose community members frequently participate in harassment campaigns. The site hosts racist material and shock content, due to which it was filtered from Google Search in 2010. The website's articles use an encyclopedic style to parody topics and events relevant to contemporary internet culture. Encyclopedia Dramatica also serves as a repository of information and a means of discussion for the hacker group known as Anonymous. It 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 its users of other internet communities they accuse of censoring themselves 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 July 2025, the only active mirror of ED is edramatica.com.