Data management is one of the driving forces behind the rapid growth of Information and Communication Technologies. The most recent advances in the area are presented and discussed in a number of events around the world. Hellenic Data Management Symposium (HDMS) is the annual forum for the Greek database community to present and discuss recent advances in the data management field. After a successful series of five events held since 2002, the 6th symposium will be held in Athens on 5th and 6th of July 2007. The program of HDMS 2007 will include research and application paper presentations, tutorials, panels and demonstrations of research prototypes. A PhD forum will also give an opportunity to graduate students to present their work in progress and receive feedback. The key criterion in judging submissions is that of technical content. As such, papers recently accepted for presentation in top international conferences may be submitted to HDMS as well and considered for inclusion in the unofficial HDMS proceedings.