DSEI 2027

DSEI is the world's largest combined defence and security event, held every two years at ExCeL London and covering the full spectrum from aerospace and land systems to naval, cyber, and security equipment. The most recent edition, DSEI 2025, was the largest in the show's history: roughly 1,700 exhibitors from 62 countries, over 60,000 visitors, and around 170 international government delegations attending for programme briefings and procurement discussions.

More than 40% of exhibitors were appearing at DSEI for the first time, and the show hosted its largest-ever SME presence - over 700 small and mid-sized defence and security firms alongside the major primes. After UK-based companies, the largest international exhibitor contingents came from the United States, Germany, and Italy, reflecting DSEI's role as a primary export and partnership venue for NATO-aligned defence industries.