Technology changed our way o,f communication. It is now easier thanks to the invention of mobile phone. Mobile phone evolves into smartphone which has much .fimctionaliry. In order to be able to make phone calls or messaging or accessing internet, we need a mobile service provider. One of the mobile providers is Indosat. In 2015, Indosat has rebranded itself as Indosat Ooredoo, which drawn many attention at that time. The CEO of Indosat at that time said that the purpose of the rebranding was to introduce the new spirit of Jndosat in te1ms o,f service qualiry. This research aims to analyze the influence of Rebranding and Service Quality on customer satisfaction both partially and simultaneously on Indosat Ooredoo users in Tembalang District. Data collection methods used questionnaires and literature studies. The questionnaires using semantic d(fferenhation scale with seven points scale and the sampling method using accidental sampling with a total of 100 samples. The proposed hypotheses were there was s,gn