This essay considers the historical periodization and epistemology of psychoanalytic thinking about gender. Overlapping historically with feminism itself, psychoanalytic thinking about gender has two periods of efflorescence, the 1920s and 1930s, and the contemporary period beginning in the 1970 s. Two divides have characterized our gender thinking, the modern-postmodern and the classical-relational. From the early theorizing of the 1920s and 1930s until around the early 1990s, most psychoanalytic thinking about gender should be considered modernist, as it draws on traditional views of scientific evidence and holds more universalistic and dichotomized conceptions of men and women. In the contemporary period, although postmodernism tends to be associated with relational psychoanalysts and modernist thinking with classical analysts, the divisions overlap. The author argues that considering any psychoanalytic theory as “premodern” is misleading: from its inception, psychoanalysis formed part of modernism.