Field experiment was carried out at Agronomy Instructional Farm, Chimanbhai Patel College of Agriculture, Sardarkrushinagar Dantiwada Agricultural University, Sardarkrushinagar, Gujarat during the rabi season of 2013 to study the effect of weed control treatment on weed dynamics and yield of mustard [Brassica juncea (L.) Czern and Coss.]. Besides weed free condition, pendimethalin 1.0 kg/ha and oxyfluorfen 0.15 kg/ha as PE were found equally effective in reducing the weed population (viz., grassy, broad-leaved and sedges), while oxyfluorfen 0.15 kg/ha as PE resulted in higher weed control efficiency, lower weed index and weed biomass. Among the herbicidal treatments, oxyfluorfen 0.15 kg/ha as PE gave significantly higher seed yield (2417 kg/ha) and stover yield (4886 kg/ha) over rest of herbicide treatments and weedy check.