Supercomputers are the fastest computers in the world. As a rule of thumb, a supercomputer is a system in the  TOP500  list of supercomputers

In e-Infrastructures, for science there are in Europe universtities and research organisations owning supercomputers.

On a European scale there are several organisations active:

• PRACE provides transnational  access to a number of supercomputers
• ETP4HPC combines a number of HPC actors in Europe
• There are several large and small EC co-funded projects