Drought is one of the most damaging climate-related hazards. The economic, social and agricultural impacts of drought have increased significantly in recent years. In this study, drought analysis in the Marmara region was examined using the Standardized Precipitation Index (SPI) as a drought index. Monthly precipitation data in the region for the period of 1975 to 2005 were used to calculate the annual, quarterly and monthly SPI at 32 stations. The longest and most intensive droughts were recorded in 1977, 1989, 1990,1992 and 1993. Conversely, 1975, 1981, 1997,1998 and 2005 were wet years.