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...