The aim of this study is to examine the nutritional knowledge levels of fin swimming (monopalet) and swimming athletes. A total of 175 athletes, 94 Elite Finned swimmers and 81 elite swimmers, participated in the study voluntarily. In the study, the "Demographic Information Form" created by the researchers and the "Nutrition Knowledge Level" questionnaire developed by Çırak and Çakıroğlu (2019) were used to determine the nutrition knowledge levels of the swimmers. The Kolmogorov Smirnov test was used to determine whether the data showed normal distribution or not. It was determined that the data did not show a normal distribution. The Man-Whitney U test was used for comparisons of two groups, and the Kruskall Wallis test was used for comparisons of three or more groups. In the study, when the nutritional knowledge levels of the elite athletes engaged in swimming and fin swimming were examined, it was determined that the nutritional knowledge level scores of the finned swimmers were higher than the swimmers (p<0.05). Athletes' nutrition knowledge level scores, educational status and are you a national athlete? While there was a statistically significant difference in sub-dimension and general total scores according to the variables (p<0.05). It was determined that the nutritional knowledge level scores did not differ statistically according to the variables of gender (p>0.05). How many hours do you train per week? When the nutritional knowledge level scores were examined according to the question, it was determined that the scores of the athletes who trained for 8 hours or less per week were lower than those who trained for 9 hours or more (p<0.05). As a result, it was revealed that the nutritional knowledge levels of the fin swimmers were higher than the swimmers.