The premise of this paper is that learner-centered classrooms characterized by cooperative learning, affective-humanistic instruction, cross-cultural instruction, and Freire’s problem-posing method promote successful language learning because they create peaceful oases in which people learn easily. They are microcosms of a just world order based on the global values of positive interdependence, social justice, and participation in decisionmaking processes. The paper discusses threats to the peaceful classroom— misunderstanding, prejudice, and destructive conflicts—and how they can be avoided or resolved. It concludes with a list of resources teachers can consult if they wish to create peaceful ESL classrooms.