This paper aims at shedding light on the concept of postmodernism، and its implications in the TESOL. Postmodern philosophy as a prevalent concept and a hot buzzword in philosophy، science، and art is believed to have influenced the TESOL theoretically in some ways. The elements of postmodernism including: constructivism، subjectivism، relativism، localism، and pragmatism are found to have been applied in the TESOL to the concept of the demise of the methods، more focus on styles، strategies، and multiple intelligences، chaos/complexity theory and critical theories. But in practice، in developing countries the TESOL still lives in the modern era.