How has Western psychology understood the concept of Gender? How have conceptualizations of Gender changed over time? Over the past 35 years, feminist psychologists have challenged what we study, who we study, how we study, and what we (think) we know about gender in psychology. Feminist psychology has both informed, and been transformed by, movements in Queer Theory, Critical Race Theory, and Disability Studies. These frameworks are integrated throughout the course. After interrogating the gender binary, we examine the gender stereotypes that support this binary, and the consequences of these stereotypes for cognition, behavior, and affect. Key topics include: gender in developmental psychology, sex and sexualities; objectification theory; medicalization; mental health; gender in the workplace, and gender-based violence.