We are pleased to invite you to the 7th International Workshop on Advanced Ground Penetrating Radar 2013 which will be held on July 2-5, 2013, in Nantes (France). It is the 7th of a biannual series of international scientific symposia devoted to the advancements in GPR techniques and applications. The conference is aimed at presenting a wide range of high standard scientific and technical informations to scientists, engineers and end-users of GPR technologies, as well as to offer the participants the possibility to exchange ideas and discuss their works and results. The manifestation consists in 2.5 days of conferences (July 3 to July 5 mid-day), completed with the possibility to participate to technical field demonstrations in the test sites of Ifsttar on July 2 afternoon. This series of workshops is meant to take place between the general biannual GPR international conferences, which take place every even year, in order to offer possible complementary exchanges inside the GPR community.