DSEI London 2025 (Defence and Security Equipment International) will take place from September 9–12, 2025, at ExCeL London, uniting global defense, security, and cybertech industries. As one of the world’s premier defense expos, DSEI is expected to draw over 45,000 attendees and feature hundreds of international exhibitors from across land, air, sea, space, and cyber sectors. The event facilitates collaboration among governments, armed forces, industry innovators, and strategic partners.