The purpose of research was identifying the relationship between social capital and performance of agricultural extension experts, Khouzestan province, Iran. The method of research was a descriptive-correlative. The sample size was agricultural extension experts (n=98). A five-point Likert-type scale was used as instrument to gather data in order to measure the social capital. Data were analyzed using the Statistical Package for the Social Sciences (SPSS19). Questionnaire reliability was estimated by calculating Cronbach’s alpha and it was appropriate for this study (Cranach's alpha 0.93). Te result of research revealed that the correlation between organizational performance with social participation, social status and social trust was significant. Liner regression was used to predict changes in performance by different variables. Based on the results social participation, social status and social trust, educational level and job satisfaction may well explain for 48.9% changes (R2 = 0.489) in organizational performance of extension experts.