The International Conference on Historical Linguistics has always been a forum that reflects the general state of the art in the field, and the 2009 edition, held in Nijmegen, The Netherlands, fully allows the conclusion that the field has been thriving over the years. The studies presented in this volume are an expression of ongoing theoretical discussions as well as new analytical approaches to the study of issues concerning language change. Taken together, they reflect some of the current challenges in the field, as well as the opportunities offered by judicious use of theoretical models and careful corpus-based work. The volume's contributions are organized under the following headings: I. General and Specific Issues of Language Change, II. Linguistic Variation and Change in Germanic, III. Linguistic Variation and Change in Greek, and IV. Linguistic Change in Romance.