The Triglav National Park and The Julian Pre-Alps Natural Park cooperate in the areas of European projects, research, exchange of best practices in terms of visits and professional tasks, presentations at various events and cooperation between schools in the immediate surroundings of the two parks. In 2009, they were awarded the Europarc Federation Charter for cross-border cooperation between the two neighbouring parks, in 2014 the Alpine Convention Certificate for a cross-border pilot region for ecological connectivity and in 2016 the Europarc Federation Charter for the sustainable development of tourism in the cross-border area.
The Alparc network of protected areas in the Alps brings together hundreds of protected areas of all categories, located in the countries of the Alpine arc from France to Slovenia. The Triglav National Park has been part of the network since its creation in 1995. The main purpose of Alparc is to support and promote the exchange of experience and knowledge between managers of Alpine protected areas. The network is committed to the implementation of the "Nature Conservation and Landscape Protection" protocol of the Alpine Convention.
The Alpine Convention is an international treaty concluded by the Alpine countries (Austria, France, Germany, Italy, Liechtenstein, Monaco, Slovenia, Switzerland) and the European Union to promote sustainable development in the Alpine region. Implementing Protocols on mountain farming, nature conservation and landscaping, spatial planning and sustainable development, mountain forests, tourism, transport, energy and soil protection, as well as a declaration on climate and on population and culture, are adopted to implement the agreed objectives and actions. In 2014, the Alpine Convention recognised the Triglav National Park and the Julian Pre-Alps Natural Park in Italy as official cross-border pilot regions for ecological connectivity.
In May 2017, Triglav National Park and Crater Lake National Park in the United States of America (Oregon) signed a twinning agreement to support each other and exchange knowledge and experience in the fields of nature conservation, protected area management, education, professional tasks and research. The two parks are similar in terms of latitude, rich biodiversity, and both are known for their lakes, mountains and forests. Both attract many visitors who want a peaceful break or an active holiday. In terms of management, the two parks face similar challenges, in particular how to ensure a park experience that is appropriate from a nature conservation perspective.
In June 2017, Triglav National Park received the Slovenia Green award and thus joined the Green Scheme of Slovenian tourism. The Slovenian Tourist Board developed the Green Scheme of Slovenian tourism to promote the development of sustainable tourism in Slovenia on all pillars of sustainable development, environmental, social and economic. The key strategic orientations of Green Scheme of Slovenian tourism include active orientation of tourism towards a green economy, information and incentives for tourism businesses to develop green business models, incentives for destinations to set up sustainable development models based on sustainable indicators, and raising awareness among visitors to move towards a more sustainable lifestyle for environmentally friendly behaviour.
In May 2018, Triglav National Park and the Russian Nature Reserve Kronotsky in Kamchatka signed a twinning agreement to support each other and exchange knowledge and experience in the fields of nature conservation, protected area management, education, professional tasks and research.
The Triglav National Park has a cooperation agreement with the Hoch Taunus Nature Park in Germany, Snowdonia-Wales National Park in the UK, and a tripartite agreement with Hohe Tauern National Park in Austria and Les Ecrins National Park and Mercantour National Park in France.