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Explanations for associations between social norms and drinking often focus on wanting to fit in, gain social approval, and/or avoid social exclusion. From this perspective, students who believe that drinking is strongly linked to social approval should be more motivated to drink, especially if their sense of social approval or belongingness in college is low. To evaluate this hypothesis, we examined changes in drinking as a function of fluctuations in perceived injunctive norms (ie, perceptions of others’ approval of drinking) and belongingness (ie, one’s sense of social belonging in college). Participants included 383 (60% women) nonabstaining students who, beginning in their first or second year of college, completed assessments every 3 months over a 2-year period. Data were analyzed using multilevel mixed-effects negative binomial models followed by marginal tests to evaluate nonlinear …