Giglia E. The Impact Factor of open access journals: data and trends. In: ELPUB 2010 International Conference on Electronic Publishing. Helsinki (Finland), 16-18 June 2010 This work is aimed at testing the impact factor of open access (OA) journals, to verify the hypothesis that unrestricted access might turn into more citations, that is good impact factor indexes. It is mainly focused on the JCR 2008 Science edition because of its largest coverage of OA journals (about 5%). The collected data showed that the performance of OA journals is quite good in terms of citations. These preliminary data might be useful to further comparisons and in-depth analysis.