This issue contains a collection of papers describing the state of animal laws, regulations, and standards in counties worldwide, grouped by geographic regions (i.e., North America, South America, Pacific Rim, Africa, and the Middle East). An overview of the US and Canadian legal requirements for animal welfare is provided, along with consideration of potential gaps in the US Animal Welfare Act. The EU Directive on the protection of animals used for scientific purposes and its transposition is discussed, and challenges facing laboratory animal protection regimes in Latin America and the Pacific Rim are examined. Legislation for laboratory animal use has been enacted in India and Australia, while animal protection regimes have not yet been enacted in the Middle East and Africa. International harmonization is a particularly important challenge for the global scientific community and private accreditation by organizations such as AAALAC International, plays a key role in promoting high standards for animal care and use programs globally. This article highlights three future trends. First, international efforts at harmonization will continue, and seek to keep pace with the globalization of science. Second, nations that have not yet developed robust legal systems applicable to laboratory animal welfare will seek out the expertise of those nations that have well established regimes. Third, for countries with mature animal protection systems, animal use in research will continue to be of societal concern, and efforts to change existing laws will not abate. The opportunity to use animals in laboratory research is not an entitlement. It is a privilege accorded by society to certain members of the scientific community and along with it comes the responsibility to adhere to, and seek improvement in, applicable laws, regulations, policies and standards.