I focus on the role of agroecology in rural proletarian social movements in this article. First, I highlight these movements' conception of agroecology as an important element of their political ideology. Second, I explore the value of agroecology in helping maintain the permanence of the peasantry. Third, I show that rural proletarian movements emphasize agroecology because it is key to attaining sovereignty. I draw upon the geographic lenses of territory, the production of space, and autonomous geographies in positing these arguments. Throughout the article, I draw upon a case study of the Brazilian Landless Workers Movement, one of the most vocal agroecological social movements, to illustrate these arguments.