Tourism refers to all activities that a person carries out outside his environment, ie outside his residence, regardless of whether it is a vacation, business trip or some other reason, for a maximum of one year. The term tourist is considered to be a person who travels for pleasure, voluntarily, temporarily. This pleasure can provide him with changes and innovations, which a person experiences on his journey. Tourism is one of the main drivers of the Republic of Croatia and has an extremely important impact on the economy. A large share of GDP is certainly from tourism. It also affects employment within the country, unemployment is lower during the summer months. All this is a display of how tourism is one of the most important branches within the country. Therefore, it is given importance, and continuous work is being done to improve it. Of course, there are many negative impacts in tourism, and one of the most important is the distinct seasonality. The aim of this paper is to analyze tourism as an economic activity of the Republic of Croatia, to analyze which is the supply, demand, which are positive and which are negative economic impacts of tourism. Furthermore, Turkey and Greece have a similar picture as Croatia, tourism has a great impact on the entire economy, as well as our country. Therefore, the paper also aims to compare the tourism of Greece and Turkey with the tourism of Croatia. Data from the Internet and literature were used in writing the paper. The purpose of this paper is to prove that tourism is extremely important in the Croatian economy and is one of the main items for the growth and development of our country.