Travel agencies today are certainly an integral part of planning a trip. A large number of passengers or tourists is going on a trips organized by travel agencies and they have an important role in the movement of tourists and the development of tourist destinations. The paper explains the concept of travel agencies and tourist destinations as well as the ways in which travel agency affects the development of tourist destinations. First, travel agencies are affecting the development of individual elements of the tourist destinations such as accommodation, restaurants and other entities. One of the most common ways in which travel agencies are cooperating with the stated subjects are contracts such as the contract for allotment. In the chapter on tourist destinations the concept of a tourist destination and a brief history of the formation of tourist destinations in Croatia is briefly explained. Each tourist destination goes through certain stages of life, such as research, recruitment, development, consolidation and stagnation, and travel agencies are participating in each of these stages. Agencies also affect the development of tourist destinations and the recruitment process. According to data from the Department of Statistics, there has been a growing influence of tourist agencies on the number of overnight stays and tourist arrivals in the Republic of Croatia, which is more and more every year. In the last chapter we talk about technology in business tourism and lists of the advantages and threats of such a way of doing business. From all this we conclude that the impact of travel agencies in the development of tourist destinations is only getting bigger, and it shouldn’t be ignored.