Organizational Citizenship Behaviour (OCB) levels displayed will differ in different cultures. So this study aims to examine the effect of the cultural value dimensions of nurses on the Bugis, Makassar, Toraja, and Mandar tribes on Organizational Citizenship Behavior in hospitals. This research is quantitative research with a cross-sectional study approach to 500 respondents in 5 hospitals that are considered to represent the Bugis, Makassar, Toraja, and Mandar tribes. The sample was selected by simple random sampling, then analyzed using the Multiple Logistics Regression test on SPSS software. The results showed that cultural value was a predictor of OCB (0.000 < 0.05), the power distance dimension showed the greatest influence on OCB with a p-value < 0.05. Simultaneously, the cultural values of the Bugis, Makassar, Toraja, and Mandar tribes have a relationship with the OCB of nurses. This relationship shows that the higher the cultural values possessed by a nurse, the higher the OCB displayed. In addition, it is known that the dimensions that significantly affect nurses' OCB are the power distance dimension. Therefore, the hospital management needs to pay attention to the influence of cultural values so that nurses' extra-role performance can be maintained and improved.