Welcome to the website of the "XVII. International Conference on Recent Progress in Many-Body Theories". Please join us from 8 to 13 September 2013 at the Steigenberger Hotel Sonne in Rostock, Germany. The conference continues the series initiated in Trieste in 1978 and is devoted to new developments in the field of many-body theories. The conference series encourages the exchange of ideas between physicists working in such diverse areas as nuclear physics, quantum chemistry, complex systems, lattice Hamiltonians, quantum fluids and condensed matter physics. As a central event, "The Eugene Feenberg Memorial Medal" and "The Hermann Kümmel Early Achievement Award in Many-Body Physics" will be presented in an Award Session. The proceedings of the conference will be published online in IOP Conference Series. All papers will be reviewed. The conference venue is located in the heart of the old Hanseatic town Rostock. The historic downtown and the harbor are just a short walk away.