This volume contains the papers presented at the 7th International Conference onAlgorithmsandComplexity(CIAC-2010),whichtookplaceatSapienza,U- versity of Rome, during May 26-28, 2010. The volume contains 30 accepted papers, selected by the Program Comm- tee from 114 submissions received, with an acceptance ratio of 26%. We thank all the authors who submitted papers, the members of the Program Committee and the external reviewers. We are grateful also to the ?ve invited speakers, Ricardo Baeza-Yates (Yahoo! Research), Eran Halperin (Tel Aviv University), Monika Henzinger (EPF Lausanne), Giuseppe F. Italiano (University of Rome Tor Vergata), and Bruce Reed (McGill University), that kindly accepted our invitation to give plenary lectures at the conference. We gratefully acknowledge support from Sapienza, its Department of Computer Science, Yahoo! Research and EATCS. We ?nally would like to thank Saverio Caminiti, Umberto F- raro Petrillo, Emanuele G. Fusco and M. Daniela Salvati for their help in the organization tasks. March 2010 Tiziana Calamoneri Josep D' ?az Conference Organization Steering Committee Giorgio Ausiello Sapienza University of Rome, Italy Giuseppe F.