Events, arts programs, and civic activities are oftentimes sponsored by more than one company/brand. In contrast to the interest in multiple-brand marketing activities in other areas of research (e.g., bundling, brand alliances, cooperative advertising), multiple-brand effects in sponsorship have been the subject of neither theoretical attention nor empirical research. This paper seeks to address this gap by investigating the impact of multiple sponsors on consumer evaluationsof the sponsored event.Priorattitudestoward the sponsors, the presence orabsence of a controversial/stigmatized product, the sponsor’snationality (domestic versus foreign), and product complementarity are explored in an experimental setting and demonstrate a twofold effectof a controversial sponsoron attitudestoward the event.Sponsor brand nationality and complementarity of products also affect consumers' attitudes toward the event. Implications for future research on multiple-brand sponsorship and marketer intentions are discussed. © 2003 Taylor & Francis Group, LLC.