Abstract This article presents the preparation of material for compiling an English–Slovene dictionary of criminal justice and security collocations. It presents the process of collecting and preparing material; specifically, software selection, corpus preparation, collocation extraction, and translation into Slovene. These activities were performed by students at the University of Maribor’s Faculty of Criminal Justice and Security as part of the course English Terminology. It defines the concepts of language for specific purposes (LSP) and presents the field and subfields of criminal justice and security, and gives an overview of the definitions of collocations. The article outlines the need to prepare a collocation dictionary by exploring the inclusion of collocations in dictionaries. The characteristics of possible dictionary entries are outlined based on material collected and prepared by the students. This is followed by the presentation of some examples of collocation entries from dictionaries.