The purpose of the study was to analyze the effect of satisfaction on word of mouth customers of Islamic banks in Central Sulawesi Province. This study applied two survey methods, i.e., descriptive survey and explanatory survey and was conducted from January to May - July 2018. Samples were Islamic bank customers in Central Sulawesi Province. The sample size of the study was 345 respondents spreading in several Islamic banks in Central Sulawesi Province, which included: Syariah Mandiri KC Palu Bank, Syariah Mandiri KC Luwuk Bank, BNI Syariah Bank, Muamalat Bank, BRI Syariah Bank. The variables of the study were customer satisfaction and word of mouth. The results of the study showed that customer satisfaction was classified as a good category, with the mean score was 3.62. The mean value for WOM intention was 3.55 (good category), positive valence WOM value was 3.61 (good category), negative valence WOM value was 3.59 (good category), WOM content value was 3,77 (good category). The satisfaction had a significant effect on the word of mouth Islamic bank customers in Central Sulawesi with a p-value = 0.036 (p <0.05). It can be concluded that if satisfaction increases, the desire of Islamic bank customers in Central Sulawesi to do WOM would also increase.