This study aims to determine the effect of leisure time psychological needs of Generation Z university students on their general self-efficacy levels. The study group of the research consists of 239 participants, 173 (72.4%) female and 66 (27.6%) male, who are studying at the Faculty of Sport Sciences of a state university in Ankara. Personal information form, Leisure Time Basic Psychological Needs Scale developed by Vlachopoulos and Mchailidou (2006) and adapted into Turkish by Güneş (2019), and General Self-Efficacy Scale developed by Sherer et al. (1982) and adapted into Turkish by Yıldırım and İlhan (2010) were used as data collection tools. In the process of data analysis, firstly, it was checked whether the data set met the normal distribution parameters. For this purpose, Skewness and Kurtosis values were analyzed by looking at the significance result of Shapiro-Wilk test. After determining that the data were normally distributed, parametric tests were applied. Pearson Product Moment Correlation Coefficient (r) was used to determine the relationship between the variables used in the research. Multiple Linear Regression Analysis was used to determine the effect of participants' leisure time basic psychological needs on their general self-efficacy. In addition to these analyses, descriptive statistics and independent sample t-tests were used. In addition to Excel database, SPSS 22 package programme was used in the research. According to the results of the study, it was concluded that the mean scores of the participants obtained from the Leisure Time Basic Psychological Needs Scale and the General Self-Efficacy Scale were generally high, Leisure Time Basic Psychological Needs explained 23% of self-efficacy, and productive leisure time use significantly differentiated Leisure Time Basic Psychological Needs and General Self-Efficacy. Accordingly, the choice of productive activities in leisure time is a variable that positively affects leisure time basic psychological needs and general self-efficacy.