Green Key is a voluntary eco-label awarded to thousands of hotels and other establishments in 57 countries.

The Green Key award is the leading standard for excellence in the field of environmental responsibility and sustainable operation within the tourism industry. Holders of a Green Key have demonstrated a commitment to the strict criteria set by the Foundation for Environmental Education, that they are helping to make a difference on an environmental level. Rigorous documentation and frequent audits help to maintain the high standards expected of Green Key establishments.

Green Key eco-label can be awarded to various tourism sector players including hotels, hostels and smaller establishments, as well as campsites, holiday parks, conference centres, restaurants, and attractions.