State defence and security policies rely mostly on their military capabilities. The latter are ensured through research and development (R&D) as well as procurement, which are subject to defence industry dynamics. Furthermore the defence sector is heavily dependent on public funds; the latter can be more easily allocated if related R&D has a spill-over effect on the civilian sector, creating the potential for a bigger and more globally (or regionally) integrated market. This article investigates, then, how technology moves, and whether defence sector innovations create spin-offs in the civilian sector in the Netherlands. We aim to provide an industry-centred perspective on defence sector dynamics and potentials. For this, the article attempts to answer the following questions: Are defence technologies transferred to the civilian sector? What lessons can be derived from the Dutch case? To address these research puzzles the article’s theoretical framework builds on the technology-transfer literature in analysing the case study of the Netherlands. The basis for this is 23 interviews with representatives of Dutch defence companies that were carried out both in a workshop and in one-to-one settings in May and June 2020.