The main purpose of this research is to examine the effect of athletes' self-talk over their life satisfaction. One hundred-sixteen females (age = 24.40 ± 3.65 year) and 200 males (age = 25.28 ± 3.47 year) voluntarily participated in this research. The sample of the research consists of athletes who were in different branches and have different levels of sportiveness degree and history. In this research, information about socio-demographic variables was collected by Personal Information Form which was composed by the researcher. "Self-talk Questionnaire" and "Life Satisfaction Scale" were used to reveal individual differences between the study's variables. In the analysis of the data descriptive statistical methods and in independence examples T-test and Multiple Stepwise Regression Analysis methods were used. In the result of the present research, in addition to obtained conclusion that self-talk levels of athletes are a predictor of life satisfaction, it has been observed that self talk levels of athletes differ from each other regarding gender variable (p < 0.05). Also, it has been observed that the life satisfaction levels of athletes differ in terms of gender variable (p < 0.05). As a result, it has been thought that the relationship between life satisfaction and motivational and cognitive self-talk can be explained by self-determination theory.