The comprehensive progress that surrounds us enables better results in sports and also in swimming. Swimming is a basic sport that has progressed significantly since its inception. The dolphin technique, which can be found in the literature under the names butterfly or dolphin, is also the youngest swimming technique that was developed as a variant of the breaststroke technique. In the beginning, arms were swum in butterfly and legs in breaststroke, and later, with the aim of swimming as fast as possible, the dolphin kick was introduced, and thus the fourth swimming technique, i.e. the butterfly technique, was born. The aim of researching the results in the 50 m, 100 m and 200 m butterfly of female swimmers in the finals of the world and national championships in the 50-meter pool in the period from 2006 to 2022 is the analysis of development trends and the determination of the development curve of the results, as well as the presentation of differences in results of the mentioned disciplines between Croatia and the world. The sample of participants consists of female swimmers who competed in the finals of world and national championships in the period from 2006 to 2022. The variables in the research are the disciplines of 50 m butterfly, 100 m butterfly and 200 m butterfly. The data were taken from the official websites of the World Aquatic (WA) and the Croatian Swimming Federation (HPS). The data were processed with the Statistica 14 software package for trend analysis. The development trend of the average results and the best results from the final races at the world and national championships was processed using multiple regression analysis. One-way analysis of variance (ANOVA) was used to compare the differences between the average and best results of the world and national championships in the specified period. The analysis of the development trend of results in the disciplines of butterfly technique among female swimmers in the finals of the world and national championships in the 50-meter pool in the period from 2006 to 2022 showed a linear increase in results in almost all disciplines, the only exception being found in the discipline of 200 m butterfly on world championships where there is a negative trend in the development of results. The null hypothesis was not confirmed. A comparison of the results of the national and world championships indicated a statistically significant difference in all disciplines.