The Helmholtz-Zentrum Berlin für Materialien und Energie HZB operates two large scale research facilities: the upgraded medium flux research reactor BER II on the Lise-Meitner-Campus in Berlin-Wannsee and the third generation synchrotron source BESSY II on the Wilhelm-Conrad-Röntgen-Campus in Berlin-Adlershof. In addition, it is home to a number of state-of-the-art on-site laboratories and user facilities. All those research facilities are designed to serve researchers from universities, foreign research institutions and industry. Regular open access is the standard route to apply for beamtime at HZB. Two calls for proposals each year with deadlines 1 March and 1 September are offered. All regular access proposals are reviewed by an international HZB Scientific Selection Panel (SSP). Beamtime under regular access at HZB is free of charge for national and international academic users, provided that the results from experiments at HZB will be published in the public domain. More detailed information is given at http://www.helmholtz-berlin.de/user/beamtime/proposals.