Roadmap to a Blue Port is intended to assist fishing ports to implement a Blue Transformation approach at strategic and operational level through the involvement of stakeholders, the implementation of projects and actions, and the measurement of impact. Moreover, it is a tool that will help local, regional, and national authorities to gain a better understanding of the process of transformation that is required to become a blue port. This guidance document is designed to be useful, comprehensive, didactic, and user-friendly. The guidance document is structured around three parts: a theoretical framework; principles and operational steps to become a blue port, including tools for implementation; and recommendations and conclusions. The document is the result of several consultations in which fishing ports, international port organizations, and international and multilateral organizations participated. Several participatory workshops and technical working group meetings took place during the consultative process. A review of good practices has enriched the process.