The aim of this thesis has emphasised on justice within the regulation constructed by The International Association of Athletics Federations (IAAF) concerning the eligibility for the female classification (athletes with Difference of Sex Development). Different arguments in IAAF:s regulation has been examined throughout a philosophical analysis to examine the validity of the regulation. The IAAF:s regulation validity is examined through the capabilities approach, which aims to promote individual justice of an individual and what the individual can become to her fullest. The other theory of justice originates from utilitarianism which is a type of justice that aims to bring the most fortune to the greatest amount of people. IAAF:s regulation is a governing tool which controls participation of female athletes in the elite level sport in races at international competitions. The women who get affected by its implementation are women who suffer from DSD (Disorder of Sex Development). The regulation requests that women with DSD, who develop higher amount of testosterone than the average woman, must undergo medication to participate in international competitions in different races. The effect of the medication results in the deterioration of their natural physiological health. IAAF considers it necessary since some women with DSD has an advantage in comparison to the average female athletes in the same race events. Throughout the capabilities approach this may seem as an unjust type of regulation for women with DSD. The theory of utilitarianism may see it as justice for the majority of female athletes. When applying these two types of justice, the capabilities approach and utilitarianism, the result will differ. The sports organisation IAAF has also been compared to other sports organisations. The comparison lies within what sport aims to be for the athlete. Before beginning with the analysis, the history of different control mechanism of the female athletes’ bodies will be presented to show the reader the complexity that lies in the female category of elite sports level.