Morphology Days is a (nearly) biennial international meeting which deals with morphology within different frameworks and in various perspectives Previous editions of this conference have taken place in Leuven (2015), Leeuwarden (2013), Leiden (2012), Nijmegen (2011), Luik (2009) and Amsterdam (2007) While the first editions of the conference were mainly addressed to researchers working on morphology in the Netherlands and in Belgium, the last editions – including this one – included international contributions The programme and the book of abstract is available at the conference’s homepage at https://morphologydays2017.wordpress.com/program/. Organized by Philippe Hiligsmann, Kristel Van Goethem, Nikos Koutsoukos and Isa Hendrikx from the Université Catholique de Louvain, and Laurent Raiser from the Université de Liège, this edition of Morphology Days hosted more than 30 researchers, among which 3 plenary speakers, coming not only from Belgium but also from France, Germany, Greece, Hungary, Italy, Japan, the Netherlands, Spain, the United Kingdom and the United States. Although both inflection and derivation (affixation) where dealt with in the talks, this conference report will only address the studies on derivation.