The aim of this thesis is to analyze benefits and potential threats which tourism development can cause to natural, protected areas that are increasingly flooded with tourists and tourist activities. The Northern Velebit National Park is an area of incredible natural beauty and an example of untouched wilderness that very few countries can assert, so it should be kept with great responsability. The present situation of protected touristic areas is explored on the example of the youngest Croatian national park - the Northern Velebit National Park (Northern Velebit NP). This thesis elaborates the basic features of protected areas and their connection to tourism. Current situation of tourist demand and supply of Northern Velebit NP is being displayed as well as proposals for tourism development in the mentioned national park. As one of the most beautiful and youngest national park in Croatia, it has a great advantage to attract tourists and contribute to the development of its surroundings. Having said that, sustainable development and environmental protection should be planned with great attention in order to prevent countereffects.