Crowded public spaces present critical security challenges. These challenges, which are increasingly complex in nature, encompass the threats of terrorism, organised crime, political and economic unrest, natural disasters and high-volume gatherings. To improve the understanding of the European security landscape, a scoping review was conducted in the framework of CO-SECUR EU project, with the aim of identifying and synthesising studies that focus on public space and mass events security innovations developed through bottom-up approaches, public participation or targeted public engagement, as well as studies that analyse or research security perception and behaviour. Eligible studies were published in the last decade, spanning peer-reviewed and grey literature in Europe (with focus on Spain, Belgium, Finland, Germany, Portugal, Romania, Poland, Greece, and Lithuania).