Abstract: Estimation of rainfall by satellite technology is one of valuable data production. These data need to be verified for more consistent with observed data. Tropical Rainfall Measuring Mission (TRMM) precipitation products have been extensively validated at ground sites around the world. This research is a first attempt for evaluating TRMM measurements of monthly rainfall over Iraq. Accumulated monthly rainfall collected by the Iraqi Meteorological and Seismology Organization (IMSO) at four stations, representing different climate zones, in Iraq for the period 2000-2010 were compared with TRMM measurements. Results showed that rain highly varies from one season to another and such behavior is observed in both sets of data. It was found that TRMM measurements overestimate rainfall in most months of the rainy season. The results indicated that there is a high correlation between TRMM and IMSO measurements suggesting that TRMM measurements may be used to estimate rainfall over Iraq. This could be a very useful specially for rural and deserts areas where no instruments are available for measuring rain.