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Fisheries bycatch is one of the biggest threats to seabird populations. Managers need to identify where and when bycatch occurs and ensure effective action. In 1999, the Food and Agriculture Organization of the United Nations released the International Plan of Action for Reducing Incidental Catch of Seabirds in Longline Fisheries (IPOA-s) encouraging states to voluntarily assess potential seabird bycatch problems and implement a National Plan of Action (NPOA) if needed. However, the IPOA-s is ambiguous about the steps and objectives, diminishing its value as a conservation tool. We reviewed NPOAs to identify approaches taken to determine whether seabird bycatch is problematic, how bycatch minimisation and population objectives are set, and if thresholds are specified for managing impacts. Our aim was to recommend measures for improving consistency and effectiveness in future NPOAs and other management frameworks for seabirds, with relevance for other threatened marine vertebrates including sharks, turtles, pinnipeds and cetaceans. Globally, 16 NPOAs have been published, but few effectively linked seabird bycatch risk, objectives and management. However, we identified the following best-practice elements that could improve NPOA design: (1) defining explicit risk criteria and methods to assess bycatch problems; (2) setting specific and measurable objectives for minimising bycatch and achieving desired population status; and (3) defining fishery-specific thresholds to trigger management action linked to the population objective. Consistent adoption of NPOA best practice, particularly in states that have not already developed an NPOA, would help to mitigate bycatch threats and ensure fisheries do not reduce the viability of seabird populations. • Prioritise implementing a National Plan of Action in countries with seabird bycatch • Adoption of best practice in NPOA will help mitigate the seabird bycatch threat. • Seabird bycatch problem should be identified with explicit risk criteria and methods. • Bycatch and population objectives should be specific and measurable. • Thresholds should be defined to trigger management action to achieve objectives. [ABSTRACT FROM AUTHOR]