Identifying role of extension system in adoption of new technologies have important role to developing favorable extension systems. For supporting sustainable agriculture in Iran needs extension systems to be carefully thought and accurately implemented. The purpose of this is analyzing role of extension activities in adoption of sustainable agriculture. Based on the results the attending agricultural extension and education courses was very important because significant differences were observed in adoption of all items of sustainable agriculture between participators and non participators in extension courses. Linear regression was used for predicting changes in farmers' knowledge toward sustainable agriculture. Level of education, technical knowledge regarding sustainable agriculture, income, social participation, social status, job satisfaction may well explain for 66.4% in Knowledge toward sustainable agriculture practices. [Azadeh Noorollah Noorivandi. Role of Agricultural Extension Courses in Adoption of Sustainable Agriculture. International Journal of Agricultural Science, Research and Technology, 2011; 1(3):117-120].