Gulf Cooperation Council (GCC) members are considered one of the fastest growing economies. This paper aims to empirically forecast the economic activity of the biggest GCC countries: Qatar, Saudi Arabia, and the United Arab Emirates. An Auto-Regressive Integrated Moving Average (ARIMA) model of the Gross Domestic Product in the three countries is obtained using the Box-Jenkins methodology during the 1980-2020 period. The appropriate models for the three economies are of ARIMA (0,2,1), the forecasts are at a 95% confidence level and predicts a growth in the three understudy countries for the upcoming five years.