Upon the outbreak of the SARS-CoV-2 virus, it was clear that the pandemic would not only entail physical but also psychological challenges and threats to individuals’ sustained motivation, behavioral adherence, and mental health. To encourage the Belgian authorities to take these psychological aspects into account, the Motivation Barometer, a large-scale and dynamic survey, was launched in March 2020. Its purpose was to monitor cognitive, affective, and behavioral aspects of citizens’ functioning across the pandemic, with special attention given to motivational and social factors. In the present review, we provide a description of the methodology of the Motivation Barometer, we synthesize the key findings emerging from the Motivation Barometer, we clarify how these findings were used in practice to the benefit of different societal stakeholders (i.e., the broader public, policymakers, intermediate-level organizations, and media), and we highlight its potential contribution for the management of other societal challenges (e.g., climate change, well-being). We conclude that the Motivation Barometer was a critical policy instrument during the SARS-CoV-2 pandemic in Belgium. It helped to bridge the gap between social scientists, policymakers, the media, and the general public, and, as such, allowed to demonstrate the incremental value of psychological sciences for society.