The purity movement encourages teenagers and young adults to make abstinence pledges, which are promises not to engage in premarital sexual intercourse. Moral foundations theory contends that there are individual differences in the bases of moral decision-making. The purpose of this study was to investigate, among a large sample (N = 961) of U.S. college students, whether there are differences in moral foundations between individuals who make and do not make abstinence pledges—and, among individuals who make an abstinence pledge, between those who do and do not break their pledge. Results indicated that abstinence pledgers endorsed greater binding foundations than those who did not make a pledge. Among abstinence pledgers, women who kept their pledge reported higher binding foundations than both men who kept their pledge and women who broke their pledge. Overall, these results suggest links between moral foundations and abstinence pledging.