Annisa Trisia, Eko Sakapurnama, Improving Organizational Citizenship Behavior, Why Organizational Culture Matters? Case Study at Garuda Indonesia Airlines, International Business Management, Volume 10,Issue 17, 2016, Pages 3830-3835, ISSN 1993-5250, ibm.2016.3830.3835, (https://makhillpublications.co/view-article.php?doi=ibm.2016.3830.3835) Abstract: Now a days, in the emerging market economy, human resources management become one of the key success factor to leverage the business. Organizational citizenship behaviour is important to boost organizational performance. This study aim to analyze the influence of organizational culture toward Organizational Citizenship Behavior (OCB). The second one is to analyze other factors that affect Organizational Citizenship Behavior (OCB). This research was conducted at the head office of PTGaruda Indonesia (Persero) Tbk, one of the 5-star airlines rated by SKYTRAX. The method of this research is mixed method both quantitative and qualitative through a survey using a questionnaire and in-depth interview, respectively. The data gathered from 83 permanent employees as a respondents obtained were analyzed using simple line arregression techniques. The result of this study indicates that organizational cultureh as significant influence on Organizational Citizenship Behavior (OCB) of permanent employees at the head office of PTGaruda Indonesia (Persero) Tbk. Other factor namely climate and environment of job, role of leader (leadership action), system of remuneration, reward system and recognition is give effect to increase organizational citizenship behaviour. Keywords: Organizational culture;Organizational Citizenship Behavior (OCB);emerging;qualitative;quantitative