This research aimed to determine the differences between the junior (U20) water polo players of national teams of Serbia, Montenegro, and Australia in the anthropometric characteristics and body composition. The first sub-sample of the subjects consisted of 15 water polo players of the Serbian national team, the vice-champions of the FINA World Men's Junior Water Polo Championship in Kuwait 2019. The second sub-sample consisted of 18 water polo players of the Montenegrin national team, who occupied the sixth position and the last sub-sample of the examinees consisted of 13 water polo players of the Australian national team, who occupied the eleventh position on the championship. The players were tested at the final preparations just before the World Championship. Anthropometric characteristics and body composition were evaluated using a battery of 11 tests: body height, body weight, triceps skinfold, biceps skinfold, skinfold of the back, abdominal skinfold, upper-leg skinfold, lower leg skinfold, body mass index, fat percentage, and muscle mass. The results of the ANOVA displayed that the water polo players of the three national teams do not have statistically significant differences in the variables for assessing anthropometric characteristics and body composition. The results obtained in this research showed average team values for the estimated variables of water polo players of the three national teams (U20) who participated in the World Championship. That can serve as model parameters for all teams who want to participate in U20 water polo World Championship. Differences in classification among water polo players may be related to the motor abilities, technical and tactical parameters as their anthropometric parameters were found to be similar.
