The Editorial Board of Diametros - An Online Journal of Philosophy is planning to publish a special edition of the journal dedicated to actual and possible applications of Thomas Aquinas’ moral theory to the problems of contemporary practical ethics. The thematic scope of the publication is considerably broad, and that in two respects. On the one hand, we believe that there are a number of issues in St. Thomas’ moral philosophy, in particular his doctrine of natural law, which need to be considered in relation to contemporary practical ethics. On the other hand, Aquinas’ moral theory will certainly shed new light on many issues in practical ethics, especially in bioethics. Thus we do not wish to limit the scope of the articles published in the special edition. However, we would appreciate that the articles not be focused too narrowly on specific issues, so that the special edition will be of interest to a broader audience and not only to specialists in St. Thomas’ ethics.