This study investigates Poland’s role in enhancing EU land force interoperability through its participation in the Permanent Structured Cooperation (PESCO) and the EU Battlegroups initiative. Drawing on Poland’s strategic geopolitical position and its leadership in PESCO projects, this paper highlights contributions to mobility, cybersecurity, and rapid response capabilities. Poland’s leadership in EU Battlegroups, including the Visegrád and Weimar groups, underscores its commitment to EU defence frameworks despite operational challenges, such as political discord among allies. Findings reveal Poland’s dual role in bridging EU and NATO defence efforts, emphasising military modernisation and shared standards. This study concludes that Poland’s proactive engagement is vital for advancing European defence capabilities and fostering strategic autonomy in an evolving security landscape.