Nissepedia is a Swedish-language online knowledge project that presents itself as a free database, offering readers an unusual and often satirical take on information and ideas. Its wiki invites visitors to browse articles or discover something unexpected through a random-page feature. The project has been maintained by a community of contributors, with registration controls introduced at times to limit spam and protect the site.

Beyond its online articles, Nissepedia has also brought selected material into print. Its book, Nissepedia – i urval, collected satirical articles from the website and was published by Videnskabens Förlag in a limited run. The project has discussed further book plans and a second volume, although updates indicate that these ambitions have not always come to fruition. A cultural association was formed to support the publishing effort, and the site has described the work as an independent cultural initiative. Nissepedia combines collaborative writing, irreverent humor, and occasional print publishing, appealing to readers interested in unconventional satire and an alternative to conventional reference material.