Industrial and organizational psychology, or I-O, is concerned with the study of human behavior in the context of work. Since the growth of I-O psychology over the past century, research on diversity has proliferated, with much of this scholarship focusing on a single axis of diversity, such as gender or race/ethnicity. However, research that examines a single axis of identity (e.g., gender) tends to focus on the most prototypical subordinate members of that group (e.g., White women) at the expense of considering other group members who hold additional subordinate identities (e.g., women of color and/or transwomen). One consequence of the single-axis approach that pervades I-O diversity research is the erasure, invisibility, and marginalization of people with multiple subordinated identities. In contrast to this single-axis approach, intersectionality is a feminist framework that accounts for the mutual interdependency of multiple social identities: the meanings of one social identity group depend on its intersections with other identity groups. Intersectionality is concerned with the simultaneous interplay of various social group memberships and the location of these social groups within larger structures of power, privilege, and oppression. In this chapter, we aim to provide I-O psychologists with an introduction to intersectionality as an analytical lens for research. Intersectionality as an analytical lens serves as an approach to guide the formulation, testing, and interpretation of research questions. This chapter is structured as follows. We begin with a brief history of intersectionality scholarship, an important branch of feminist theory spearheaded by women of color. Next, we discuss the relevance and importance of intersectionality to I-O psychology. Finally, we provide guidelines and challenges for I-O psychologists interested in engaging with intersectionality in their research.