LiveJournal（经常被简写为LJ）是一个在互联网上提供写作的虚拟社区服务。而由于这项服务以GPL授权发布原始代码，所以LiveJournal也被用来指这套代码。

LiveJournal由Brad Fitzpatrick于1999年成立，当初是为了与高中朋友们保持联系。在 2005年1月时，Six Apart买下Danga Interactive，也就是提供LiveJournal服务的公司。

LiveJournal在英语国家最为流行(although there is a language selection feature)美国拥有其最多用户。There is also a sizable Russian contingent. LiveJournal is the largest online community on the Runet, with about 45% of all entries in the Russian blogosphere. 根据Alexa Internet，LiveJournal50% 的访问来自俄罗斯。下表是LiveJournal用户最多的十五个国家（2010年5月22日） (based on the information listed by the users):

LiveJournal / LJ or Zhivoy Zhurnal (Russian:Живой Журнал)/ZheZhe (Russian:ЖЖ) in Russia, is a social networking service based in San Francisco, California, where Internet users can keep a blog, journal or diary. A wide variety of political pundits also use the service for political commentary, particularly in Russia, where it partners with the online newspaper Gazeta.ru. As with many other social networks, a wide variety of public figures use the network.