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The social psychology literature on prejudice reduction reports only very few field studies from which researchers can draw reliable causal conclusions. The present paper has two goals. First, we encourage social psychologists and public policy decision-makers to carry out more randomized field experiments on the reduction of prejudice and discrimination. To this end we begin with a discussion of methodological considerations and guidelines for designing and conducting such experiments. Our second goal is to contribute to the growing literature on effective interventions aimed at reducing prejudice. In the second part of the article, we report three field experiments that evaluated the effectiveness of different interventions. Experiment 1 examined the beneficial effect of “diversity training” whereas in Experiments 2 and 3, we tested the effectiveness of a poster highlighting differences among members of a minority group. In all three experiments, half of the participants were subjected to the intervention, and the other half were not. Both types of interventions were shown to be effective. The results are discussed in light of other methods of prejudice reduction.