Tourism is a leading sector of developing countries and it has multiple impacts on the economy of the country or a region that develops it. While it has many positive impacts on the one hand, on the other hand it carries a large number of negative impacts, both on the economy and whole society. Considering that tourism is now taking a major step, its negative impacts are rarely mentioned. Although it provides many new opportunities for employment, there are numerous disadvantages of hiring in tourism. During the touristic season, there is an increase of prices for goods and services. Small local businesses often go away because it is difficult for them to compete with foreign – owned companies. Tourism undermines culture and infrastructure is often difficult to cope with the increase in the number of population caused by tourists. Import of Western goods and services is the most common threat to the local community and leads to the loss of local customs and traditions. Traditional industries are being fired and authentic domestic product replaced by irrelevant imported. Barcelona and Split are Mediterranean cities which are developing tourism. Barcelona is a tourist giant that has been counting for a high rate of tourist growth for years, and it clearly – expresses the dissatisfaction of the local population due to the poor control of tourism development since the very beginning of development. Split is a small town that has been experiencing high growth rates in recent years, and is becoming more and more like Barcelona. For this reason, it is necessary to begin to monitor its development in a timely fashion and foresee future developments. It is extremely important to regulate tourism properly, locally and nationally. Adopting tourism development strategies is of paramount importance for city and its population. Here is presented analysis of the negative impacts of tourism on the destination and local population that occur if tourism is not regulated properly. Such analysis serve as a basis for making decision in order to mitigate the observed negative effects.