This research aimed at identifying the impact of psychological capital dimensions (self-efficacy, hope, optimism and resilience) on team performance at advertising agencies operating in Amman city. Moreover, the study examines the moderating role of leadership behavior on the relationship between the psychological capital and team performance. The researchers rely on descriptive and analytical approach, where the research population consists of all employees working in thirteen advertising agencies operating in Amman city. Convenience sampling technique was applied to distribute (250) questionnaires on the research sample. To analyze the research data; the researchers used a set of statistical methods including Cronbach's alpha along with a normality test, standard deviation, exploratory factor analysis, confirmatory factor analysis, multiple regression, interactive hierarchical regression and process procedures methods using SPSS-V20 and AMOS-V23. The results indicate that there was a statistically impact of psychological capital dimensions (self-efficacy, hope, optimism and resilience) on team performance in advertising agencies operating in Amman city. There was also a significant and role for leadership behavior as moderating variable between psychological capital dimensions and team performance.