The recent proliferation of jihadist incidents of terrorism in recent years has heightened interest in the modus operandi of terrorist operations. Available literature suggests a strong link between criminality and terrorism and the emergence of a crime-terror nexus. Current research on the nexus is based on dated examples and very rarely incorporates theory or an analytical lens. The purpose of this thesis is to explore modern manifestations of the crime-terror nexus from a social perspective in response to emerging data. The research reviews recent open-source data and literature at the institutional level, organisational level and the individual/social level. Analysis was approached from selected social and criminological angles including rational choice theory and a social psychological standpoint. Conclusions pointed to the increasing importance of social factors in areas such as radicalisation and group interactions to the processes of terrorism. Rather than attempting to explain causality, the study simply encourages the use of alternative perspectives when addressing the threat of terrorism. The thesis encourages academics and policy-makers to address the crime-terror nexus as a social problem that is fast becoming a national security threat. The research also highlights the importance of...