The aim is to determine the aggressiveness and happiness levels of licensed working Taekwondo athletes. After receiving ethical approval, 254 taekwondo athletes who were licensed in Kocaeli province clubs were informed about the research, and the Oxford Happiness Scale developed by Argyle et al. and Buss Perry aggression scale were applied to those who wanted to participate voluntarily. The data were analyzed by parametric tests (t test,variance analysis) and Pearson correlation test because the showed normal distribution. As a result, there was no difference in the lecels of aggression and happiness in terms of age, gender and maternal educational status. While the level of happiness was found to be significant only according to the purpose of sports; the level of aggression; all lower dimensions according to educational level; verbal aggression according to economic situation; and the lower dimensions of physical and verbal aggression according to father education status were found significant differences. It has also been seen that aggression decreases while happiness increases. It has been observed that happiness increases when the goal of sports is to contribute to the quality of life and to do the job that he loves, and happiness decreases when results-oriented efforts towards winning something are made. It was also found that physical and verbal aggression increased as their fathers' education levels decreased, while verbal aggression increased in those with moderate and good income status.