This book presents a collection of essays on the wide diversity of meanings of complex criminality. These essays were written to commemorate a national gathering of PhD candidates, from criminal law departments of different universities, at the University of Amsterdam on the 6th of June 2014. 'Complex criminality' is a very broad notion with many distinct meanings, e.g., complicated criminality -which may actually apply to all forms of criminality-, sophisticated criminality, common facts rendered more difficult to understand for lay persons as a result of translation into criminal legal jargon, or the systemic nature of certain crimes.This book offers the reader unique perspectives on complex criminality by authors from various fields of specialization.