There are several different definitions of sport tourism and there is no general acceptance. Numerous authors point out their definitions even though they share the necessity of individuals for sporting activities in the destinations they visit. There are more systems in the field of sports, such as: professional sport, amateur sport, recreational sport, school sports, sports people with disabilities and others. Sport tourism is a product of tourism because it generates additional demand and enriches the tourist offer itself. The Republic of Croatia abounds in natural landscapes of exceptional beauty and has a large number of complexes, terrains for different team and individual sports. The potential of sport tourism is large but still inadequately used. The research conducted for this work on the example of the seven counties showed that most counties still do not use sport tourism to attract new guests and expand the offer. In some cases, the county has an adequate sports offer, but is simply not placed in a visible place or is insufficiently advertised, so potential guests when viewing brochures and websites can not sufficiently notice that offer. In other cases, counties with a rich offer of recreational tourism and cultural offer generate more traffic without accompanying content such as sports, so they have not yet begun to develop more intensively any other forms of tourism. The research conducted for the needs of work in the area of the tourist communities of northwestern Croatia showed that there is a certain interest of tourist communities for the further development of sport tourism and the promotion of its promotion. Key words: sport tourism, activity, research, county, northern Croatia