One Health refers to the collaborative efforts of multiple disciplines working locally, nationally and globally to attain optimal health for people, animals and our environment. The One Health approach is increasingly popular in the context of growing threats from emerging zoonoses, antimicrobial resistance and climate change. The Food and Agriculture Organization of the United Nations, World Organisation for Animal Health and World Health Organization have been working together in the wake of the avian influenza crisis in the Asia-Pacific region to provide strong leadership to endorse the One Health concept and promote interagency and intersectoral collaboration. The programme on highly pathogenic emerging diseases in Asia (2009-2014) led to the establishment of a regional tripartite coordination mechanism in the Asia-Pacific region to support collaboration between the animal and human health sectors. The remit of this mechanism has expanded to include other priority One Health challenges, such as antimicrobial resistance and food safety. The mechanism has helped to organize eight Asia-Pacific workshops on multisectoral collaboration for the prevention and control of zoonoses since 2010, facilitating advocacy and operationalization of One Health at regional and country levels. The tripartite group and international partners have developed several One Health tools, which are useful for operationalization of One Health at the country level. Member States are encouraged to develop a One Health strategic framework taking into account the country's context and priorities.