A Marine Mammal Management Toolkit has been released by the European Union-funded Ocean Governance project. Marine mammals are increasingly subject to anthropogenic threats such as bycatch, ship strikes and noise pollution. There is a real need for effective conservation measures, which are often applied through the designation and management of Marine Protected Areas (MPAs). However, their success is often limited due to lack of capacity, resources and on occasion of relevant expertise. This Toolkit will provide knowledge to support marine mammal conservation in MPAs.