Introduction. There are currently no studies published on the relationship between participation in international sports events and physical activity of the fans. This inspired the authors to examine this subject. The aim of the study was to estimate the level of physical activity of Polish national teams' supporters of selected sports disciplines. Material andmethods. The study was conducted on randomly selected group of fans during the Polish national level football, basketball and volleyball games. The study used the diagnostic survey method with a questionnaire of the authors' own design. In this report there were questions concerning physical activity modelled on the International Physical Activity Questionnaire. Results. Physical activity is usually practised by fans of basketball and football who are 19-35 years old. Fans who are not physically active are mainly the fans of volleyball and football who are 36-55 years old. A significant correlation was noted between fans' sex and the willingness to practice sport (p=0.016). 58% of women and 72% of men declared that they practice some recreational physical activities. The most active were the basketball fans; the least active were the volleyball fans. The greatest diversity in terms of physical activity depending on participants' sex was revealed among the fans at international football games. Additionally, a significant correlation was noted between fans' age and their willingness to practice sports in their free time (p<0.001). Conclusions. The majority of fans at international sports events are physically active. In the research groups analysed the weekly volume of physical activity varied significantly. The basketball fans spent the greatest amount of time on physical activity and the volleyball fans the lowest. The average frequency of physical activity was the same in all groups.