This study seeks to expand the literature on predicting friendship diversity beyond race/ethnicity to include religion, social class, and sexual orientation. Survey packets elicited information regarding up to four close friendships developed during college. Additional measures assessed pre-college friendship diversity, participation in college activities and diversity education, intergroup attitudes, and interpersonal communication apprehension. A total of 588 friendships (213 intragroup and 375 intergroup) were reported by 151 college students. Pre-college friendship diversity was the primary predictor of college friendship diversity across each intergroup dimension. Implications for prejudice reduction are discussed.