This chapter explores the theoretical concept of Sixth-Party Logistics (6PL), a speculative evolution beyond current 5PL capabilities. While 5PL represents today’s pinnacle of digital integration and autonomous decision-making, 6PL envisions a future where artificial general intelligence, quantum computing, and bioadaptive systems converge to create truly cognitive supply networks. These theoretical networks would not merely optimize existing operations but could independently innovate, evolve, and generate novel solutions to unprecedented challenges. The chapter examines key characteristics of potential 6PL operations, including cognitive supply networks, quantum-enabled optimization, bioadaptive systems integration, and advanced environmental sustainability. Through conceptual frameworks and a speculative case study, the chapter illustrates how future supply chains might transcend traditional optimization to become self-evolving ecosystems capable of understanding complex market contexts and proactively adapting to change. While these concepts remain theoretical, they provide valuable frameworks for considering future developments in supply chain management as technology continues to advance and market requirements grow increasingly complex.