The 34th International Workshop on Statistical Modelling (IWSM) will be held in Guimarães (Portugal) 8-12 July 2019. The IWSM2019 aims to involve both academic and professional statisticians and data analysts with a particular focus on real data problems which involve an element of novel statistical modelling, or novel model application. Papers focusing on applications with important substantive implications as well as methodological issues are welcome. Submissions by students and young researchers are particularly encouraged.