This document contains an agenda for a workshop on Big Data in Secure Societies. The workshop will bring together stakeholders from the European Commission, EU agencies, space organizations, and private companies to discuss big data needs and challenges in security domains. It will also present outcomes from the BigDataEurope project, including a pilot on using big data for secure societies. The day-long workshop will include presentations on big data and security, space data for secure societies, and initiatives in applying big data to space and security issues. There will also be a session for questions and discussion. The goal is to help build a community around applying big data and new technologies to security problems.