The United Nations proclaimed May 22 the International Day for Biological Diversity in order to indicate a biodiversity as a global asset of tremendous value to present and future generations. This date also commemorates the adoption of the Convention of Biological Diversity as one of the most important international agreements covering the nature conservation issues. The objectives of this Convention are conservation of biological diversity, sustainable use of its components and fair and equitable sharing of the benefits arising from the utilization of genetic resources, including appropriate access to genetic resources. Every year the International Day for Biological Diversity is dedicated to one of the key issues related to biological diversity such as agriculture, climate changes, invasive alien species or forests.

The Republic of Croatia celebrates the International Day for Biological Diversity each year on 22 May, as well as the Nature Protection Day. The Nature Protection Day was proclaimed in 2003 by the promulgation of the Nature Protection Act adopted by the Croatian Parliament. The competent authorities, the State Institution for Nature Protection, public institutions for management of protected areas and protected natural values, NGOs and some other participants celebrate each year the Nature Protection Day by organizing educational, training, recreational, professional and other activities.

The Ivo Horvat Nature Protection Award is traditionally given on the Nature Protection Day in the Republic of Croatia to prominent persons and organizations deserving praise for the promotion of nature protection.