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The mass catering sector is directly affected by food waste reduction targets set by the government. In this article, we present the results of an exploratory study of the existence and influence of personal and social norms on waste behavior in mass catering. We reveal the existence on the one hand of a personal norm against waste and, on the other hand, of contradictory descriptive and injunctive norms that are expressed either at the level of the individuals one eats with or at the level of the wider customer collective. In order to modify behavior, recommendations to strengthen personal and social norms against waste are proposed.