The use of animals in research, teaching, and testing is regulated around the world by specific laws. Since regulatory processes are highly variable, a broad variability in the care and use of animals in scientific procedures exists internationally, as well as in the region of Southeast Europe. It is necessary to initiate an effort to promote the harmonization and improvement of laboratory animal science world-wide. The aim of this article is to explain the structure, organization, and aims of the International Council for Laboratory Animal Science (ICLAS) and to describe the role of this organization in the promotion of care and use of laboratory animals in this region of Europe.Facultad de Ciencias Veterinarias