This research examines perceptions concerning living (n = 1,253) and nonliving (n = 1,259) organ donation among Hispanic adults, a group considerably less likely than the general population to become donors. Measures are derived from the Theory of Planned Behavior (Ajzen, 1991) and Vested Interest Theory (Crano, 1983, 1997). A substantial percentage of respondents reported positive attitudes and high personal stake concerning organ donation. Mean differences in norms, attitudes, intentions, and assumed immediacy of payoff were found between living and nonliving donor groups, suggesting that these two donation formats are dissimilar and should be examined independently. Accordingly, separate hierarchical multiple regression models were estimated for living and nonliving donation. Analyses supported both theoretical frameworks: Constructs associated with Planned Behavior and Vested Interest independently contributed to donor intentions. The implications of these results, and our recommendations for future health campaigns, are presented in light of these theoretical models.