LinuxTag was an annual Free and Open Source Software (FOSS) conference and exposition with an emphasis on Linux but also BSD descendants located in Germany. The name is a compound with the German Tag meaning "Day", as it was initially a single day conference, but soon extended to multiple days, then always including a weekend. LinuxTag was the world's largest FLOSS conference and exhibition for years and aimed to provide a comprehensive overview of the Linux and Free Software market as well to promote contacts between users and developers. With this broad approach LinuxTag was one of the most important events of this kind.
LinuxTag's slogan, "Where .COM meets .ORG", refers to its stated aim of bringing together commercial and non-commercial groups in the IT sector. Each year's event also had its own motto, often reflecting a specific topic which was focused in that year.