9 papers from the session on Mesolithic/Neolithic Interactions in the Balkans and in the Middle Danube Basin held at the 15th UISPP Congress in Lisbon in September 2006. Contents: 1) Mesolithic/Neolithic interactions in the Balkan Peninsula and the Carpathian Basin: an introduction (Marek Nowak); 2) The chipped stone assemblages of Mentese and the problem of the earliest occupation of Marmara region (Ivan Gatsov, Petranka Nedelcheva); 3) Late Mesolithic of Serbia and Montenegro (Duan Mihailoviae); 4) Mesolithic-Neolithic interactions in the Danube Gorges (Duan Boric); 5) Palaeogeographical background of the Mesolithic and Early Neolithic settlement in the Carpathian Basin (Pal Suemegi); 6) Mesolithic foragers and the spread of agriculture in Western Hungary by (Eszter Banffy, William J. Eichmann, Tibor Marton); 7) Early Neolithic raw material economies in the Carpathian Basin (Katalin T. Biro); 8) Neolithisation of the upper Tisza basin (Janusz K. Kozlowski, Marek Nowak); 9) Problems in reading MesolithicNeolithic relations in South-Eastern Europe (Janusz K. Kozlowski, Marek Nowak)."