The purpose of this study is to analysis the equity in the school systems of selected OECD countries. For this purpose, the international data for selected OECD countries was analyzed in terms of four dimensions of equity as learning equity, school resource equity, participating in education, and digital equity. When analyzing data, the equity index developed in this study was used. The results reveal that the selected OECD countries seem currently insufficient to achieve equity especially in terms of learning equity, school resource equity, and digital equity. In turn, these three dimensions appear to be issues that should be coped with immediately in education agendas of OECD countries. However, this study shows some limitations, because its methodology bases on the equity index developed by the author and its findings rely mainly on self reported data (e.g. student and principal questionnaires).