Do the public in a rising authoritarian power overestimate their country’s reputation, power, and influence in the world? Excessive national overconfidence has both domestic and international consequences, but it has rarely been systematically studied. Using two studies conducted during the COVID-19 pandemic and another conducted later, I show that the Chinese public widely and systematically overestimate China’s global reputation and soft power, even during a national crisis. Critically, informing Chinese citizens of actual international public opinion of China substantially corrects these perceptions. It also moderately alters their evaluations of China, its governing system, and their expectations for the country’s role in the world. These effects from simple information interventions are not fleeting, suggesting that overconfidence can be meaningfully corrected and triumphalism mitigated. The findings have both theoretical significance and important policy implications.