Mental toughness has been defined as a natural or developed psychological power that enables athletes to cope better with their mental needs than their competitors in conditions such as training and competition environments. Mental toughness has been a concept that sports researchers, trainers, athletes and sports managers have emphasized lately and it has begun to be seen as an important prerequisite for continuous sportive success. In this context, the aim of this study is to explain the concept of mental toughness and to discuss its importance in sports by examining current publications. In the study, which was prepared in the style of a systematic review, what kind of effect mental endurance has in the field of sports in recent years, the factors it affects and current studies are examined. "Mental toughness", "Mental Toughness" and "Sport Mental Toughness" are keywords used when conducting research. According to the findings in the articles, there are studies that say that the level of mental toughness is higher in men and there are also studies that say that gender does not make a significant difference for mental toughness. When examined in terms of educational status, it was stated that the level of mental resilience increased as the education level increased. It was observed that there were no significant differences in the gender variable. Considering the age variable, the mental endurance of the athletes also increases with the increase in age. Considering the researches as experience, it is seen that experienced athletes have higher mental endurance levels than inexperienced athletes. Considering the researches as sports branches, there are also studies stating that the mental endurance levels of team athletes are higher than individual athletes. As a result, it can be said that the level of mental training plays an active role in success and continuing sports.