This entry examines postdigital warfare as a fundamental transformation in the theory and practice of conflict, where the boundaries between analog and digital, human and machine, physical and virtual dissolve. It situates postdigital warfare within evolving definitions of conflict, contrasting it with digital warfare, and highlights its hybridised architecture encompassing battlefield violence, algorithmic propaganda, surveillance ecologies, and AI-supported operations. By analysing the convergence of conventional and digital domains and offering illustrative examples such as misinformation campaigns, undersea cable vulnerabilities, and autonomous agents, the entry demonstrates how warfare in the postdigital condition transcends traditional paradigms.