The main problems of this study are: 1) To determine the influence of organizational culture and social support on organizational citizenship behavior (OCB). 2) To determine the influence of organizational culture and social support on organizational commitment. 3) To determine the influence of organizational culture and social support on organizational citizenship behavior through organizational commitment. This study uses a quantitative approach with an associative research type. The data source used in this research is primary data collected through questionnaires. The sampling technique applied is saturated sampling, where all members of the population are used as samples. Therefore, the sample in this study consists of all employees of the Secretariat of the Regional People's Representative Council (DPRD) of South Sulawesi Province, totaling 105 respondents. Data were processed using SmartPLS version 3.0. The findings of this study reveal that organizational culture has a positive and significant effect on OCB through increased organizational commitment. Social support also has a positive and significant effect on OCB through enhanced organizational commitment. The implications of this study are: 1) The results show a positive and significant statistical coefficient between organizational culture and OCB among employees of the Secretariat of the South Sulawesi Provincial DPRD, meaning that a strong organizational culture encourages employees to engage in behaviors beyond their formal duties. 2) Social support also has a positive and significant effect on OCB, indicating that a supportive work environment can enhance employee contributions. 3) This indicates that organizational commitment moderates the relationship between organizational culture and social support toward OCB, so that high commitment strengthens the influence of both on employees' OCB. Keywords: Organizational Culture, Social Support, Organizational Citizenship Behavior, Organizational Commitment