To evaluate the effects of different corn planting densities and weed control methods on weeds and corn yield, this experiment was conducted at the research farm of Islamic Azad University, Takestan branch, Iran. The experiment was conducted in factorial in the form of a randomized complete block design with four replications and two factors: corn planting density (the recommended density, +25% and +50% of the recommended one), and weeds control methods (no control, two times hand weeding, nicosulfuron SC 4% at 2-4 leaves stage, one time cultivator at corn 20 cm height and two times cultivator at corn 35 cm height). Results showed that corn planting density significantly affected ear weight and corn biological yield. The highest ear weight and biological yield were achieved in recommended density and +50%, respectively. Weeds control methods had also a significant effect on weeds; the lowest total weed density and biomass were achieved in two weedings and two cultivators.