The Qaleh Bozi sites, located about 25 km S-SW of Isfahan, were initially studied in 2004 by the Department of Geology, University of Isfahan and later in 2005 by a joint ICHTO-University of Isfahan team. During the 2005 field season, we began removing and screening the disturbed deposits on the floor of the largest site, Qaleh Bozi 2. These deposits proved to be rich in well-preserved and diverse macro-and micro-vertebrate remains and more than 2.000 lithic artifacts, mostly in fresh condition. We also made a small stratigraphic cut at the site and opened a test pit in the smaller rockshelter of Qaleh Bozi 3. The presence of bifacially shaped tools, especially foliate points, and some other aspects of the industry, such as the relative absence of Levallois technique, sharply distinguish Qaleh Bozi from other known Iranian Mousterian assemblages.