The desperate need for organ donors in the United States could be filled if every person eligible became an organ donor. Unfortunately, few organ donation campaigns exist, and fewer still have been evaluated empirically. This study has two objectives: to describe a worksite organ donation campaign and test campaign effects, and to test the Model of Behavioral Willingness to Donate Organs. Results of the campaign evaluation demonstrate that the worksite campaign was successful in increasing knowledge, favorable attitudes toward organ donation, behavioral intent to sign an organ donor card, actual rates of signed organ donor cards, and the willingness to talk to family members about the decision to donate organs. Results of path analyses produced mixed results with regard to model testing. Implications of these findings are discussed.