This study aimed at: (1) knowing about the profile of workplace characteristics, job satisfaction and organizational commitment of extension personnel in the New Valley Governorate; (2) identifying and testing the mediating effect of job satisfaction between workplace characteristics and organizational commitment. Data were collected by using a questionnaire during the period from March to May 2013 from 103 personnel representing about 85.1 % of the total number of extension personnel in this Governorate (121 Personnel). Data were described by the arithmetic mean. The results revealed the moderate presence of the workplace characteristics inside the agricultural extension workplace of the New Valley Governorate. Low levels of job satisfaction and commitment were found among the respondents toward their organization. The mediation analysis confirmed that job satisfaction is significantly mediating the relationship between workplace characteristics and organizational commitment. This indicates that workplace characteristics predict job satisfaction, which in turn is an antecedent to organizational commitment.