Abstract: In doing their duties and responsibilities as civil servants, the positive feeling of employees in finishing their tasks will affect their level of success object and target of organization or agency where they worked. Based on preliminary survey, level of satisfaction of civil servants between 2015-2016 on Indonesia, Banten Provincial Environment and Forestry Office had been decreasing in to level of 4.4%. This had become the main reason of researcher to find out what factors that affect the decreasing level of job satisfaction of civil servants. In preliminary survey shows that there are factors that affect level of satisfaction of civil servants which leadership style, organizational culture and career development. The type of research that used in this research is descriptive with quantitative method. The independent variables are leadership style, organizational culture and career development. The dependent variable is job satisfaction. Research population was all of 182 civil servants in Banten Provincial Environment and Forestry Office and sample of 125 respondents. Data analysis was using multiple linear regression analysis. Based on data processing, the results of the test were that variable of leadership style had positive and significant effects on job satisfaction, variable of organizational culture had positive and significant effects on job satisfaction and career development had positive and significant effects on job satisfaction. It may be concluded that leadership style, organizational culture and career development were factors that increased the employee’s job satisfaction in doing their tasks which will affect their level of success object and target of organization or agency where they worked.