The GUADEC, the GNOME Users And Developers European Conference, is an annual conference taking place in Europe, whose topic is the development of the GNOMEdesktop environment.
The first GUADEC was organised by Mathieu Lacage as a one-off event and attracted around seventy GNOME contributors. It was the first time many of them had met in person. The conference was judged a success, and has been held annually in different locations since then, organised by local volunteers. The size has increased fivefold since the first conference.