Drought is a phenomenon of climate and is one of the catastrophic events that cause much damage on each occurrence. One of the ways of drought adjustment, evaluation and drought monitoring is based on indicators that can be used to determine its extent and continuity in a region. In this study, drought analysis (the duration and severity of drought) in the north Iraq region was studied by using the Standardized Precipitation Index (SPI) for time intervals of 1, 3, 6, 9 and 12 months. That feature of this method helps to compare the drought events in different places and scales. To observe dry and wet periods and the severity and length of drought monthly rainfall data of 15 meteorological stations of the northern Iraq provinces from 1979 to 2013 were used. Calculations were performed on the SPI by using the SPI code in MATLAB computer software. The results of the study showed that the continuity of dry periods in the 6, 9 and 12 month periods was higher than in the 1 and 3 month time intervals. Moreover, according to the calculation, the driest year was observed in 2008. This analysis is essential because it gives full information about the longest dry and wet periods for all stations of the region.