Despite growing interest on identity theory by entrepreneurship scholars, limited research on mentor’s identity perspective is present in the literature. Hence, we propose the theory of social identity as a lens that sheds light on the understanding of the heterogeneity in meanings that mentors associate with their pro-bono mentoring endeavors. Social identity theory acknowledges a solid understanding of an individual’s sense of self, as social identity is essential to an individual's beliefs, feelings, values, and actions in all social context, including mentoring endeavors (Hogg & Terry, 2000). Social identity theory may also shed light as to why different outcomes occur from different individuals; providing a theoretical link between social identification and behavior where mentors act in ways that confirm their identities (Hogg & Terry, 2000; Tajfel & Turner, 1979). Drawing on social identity theory, our aim is to establish a typology describing the major types of mentor’ social identities. The typology will shed light on the social categorizations that individuals make as mentors and, specifically, the meanings they associate with being mentors. We did an in-depth exploratory study of 30 pro-bono mentors. Data collection was made via interviews through an inductive methodological approach.