StudiVZ is a social networking platform for students (in particular for college and university students in Europe) and is based in Berlin, Germany. The name is an abbreviation of the German expression Studentenverzeichnis, which means students' directory.

The service is largely comparable to other social networking sites. StudiVZ claims to be one of the biggest social networks in Europe, with (reportedly) over 15 million members as of September 2009, mostly in the German-speaking countries of Germany, Switzerland, and Austria. However, traffic to the site has entered a state of steady decline since late 2009.