Complexity theory is the science of studying adaptive complex system. This science includes chaos theory, self-organization theory and fractal geometry. The origin of this theory is in Biology. Although there are common elements between ontology, epistemology and methodology of complexity theory and postmodernism, we can’t say complexity theory is a postmodern theory because there are also similarities between complexity science and positivism paradigm. In this paper, we will compare complexity theory to postmodernism and positivism and the result is that complexity theory is not fully a postmedern theory.