In his article the author presents he main development trends in concentration and integration of internal trade in Poland. The analysis covers the issues of capital concentration of commercial companies (with attention focused on the subsidiary-type commercial networks and corporation-type networks), organisational and organisation-and-functional integration (retailers’ associations, purchasing groups), as well as functional-and-spatial concentration (shopping centres). The results of the analysis point to, inter alia, some progress in integration development (particularly as regards evolution of its simple forms towards more complex, especially franchising systems and capital alliances) induced by the on-going processes of capital concentration in the fast moving consumer goods (FMCG) market. Besides, they indicate acceleration of shopping centres development dynamics.