Field experiment was carried out at the farm of the Dept. of Field Crop Science , College of Agriculture , University of Baghdad during the season 2008 / 2009 to evaluate the effect of pendimethalin and pyroxsulam herbicides on growth characteristics , grain and yield components of some wheat cultivars . Results showed that both herbicides were significantly efficienct in studied characteristics compared to weedy treatment . A positive effects were recorded for yield and yield components. The results showed that the reduction of weed density and weed dry weight in Iraq cultivar reached 90.7 plant / m2 , 24.4 g / m2 respectively . Tahaddi cultivar produced the highest grian yield ( 6.7 t / ha ) , biological yield ( 17.7 t / ha ) and harvest index (16.7 %) . However the cultivar Abu-Graib3 gave highest number of spikes 452.2 per / m2 . While IPA95 cultivar was 97.8 cm height . The differences of wheat cultivars in their growth characteristics may be considered as indicators for determination the cultivars competitive ability against weeds .