This study examined the contributions of campus racial climate perceptions and other college environments to overall sense of belonging among racially diverse women in science, technology, engineering, and mathematics (STEM) majors. The sample included 1,722 women from the 2004 National Study of Living-Learning Programs. Using a conceptual framework that integrated Weidman's (1989) undergraduate socialization model, Astin's (1991) I-E-O model, and Mertens' (2005) transformative research perspective, 29% of the variance in overall sense of belonging was explained. Race/ethnicity, perceptions of the campus racial climate and the residence hall climate, and academic self-confidence emerged as significant predictors. Implications for supporting women in STEM are discussed. (Contains 2 tables.)