The chapter provides a comparative account of cybersecurity public–private partnerships (PPPs). It argues that PPPs bring together the law-making powers of the states with the know-how of the private sector, that both are necessary to effectively deal with cybersecurity threats, and that the benefits of PPPs outweigh their limitations. It then empirically analyses the laws and regulations surrounding cybersecurity PPPs in eighteen different domestic jurisdictions to find a common denominator that could be transposed into international cybersecurity PPPs. Finally, it discusses the modalities that international cybersecurity PPPs could take and proposes a new international treaty incorporating PPPs, under which states undertake to establish domestic mechanisms for collaborating with the private sector in cybersecurity.