The Ernst Ruska-Centre (ER-C) for Microscopy and Spectroscopy with Electrons is a German research establishment conjointly operated by the Jülich Research Centre and RWTH Aachen University on a pari passu basis. The facility, which also offers user services to external research groups, is located on the campus of Research Centre Jülich belonging to the Helmholtz Association of German Research Centres.
The ER-C was founded in Aachen on 27 January 2004 by means of a contract signed by the chairman of Forschungszentrum Jülich Joachim Treusch and RWTH Aachen University's rector Burkhard Rauhut. The centre was inaugurated on 18 May 2006 in presence of members of the Ernst Ruska family as well as representatives of the international electron microscopy community.