This Research Note presents 60 key databases, data sets and chronologies on terrorism events data developed since 1968. It describes design characteristics of these quantitative data collections and points to their usefulness for research on terrorism and counter-terrorism. The information presented here is divided into three categories: (i) Academic, Think Tank and Independent Databases (n =43)(ii) Commercial Databases (n = 10) and(iii) Governmental Databases (n = 7).In a few cases, the scope of the datasets includes related forms of armed conflict. In most cases, there are clickable links to the data storage sites. All website links have been validated as of 11 August 2017.