Happiness can be learned. With this postulate, self-help authors at least make their bank accounts happy. But psychologists also know: Everyone can influence their thinking and actions to some extent and thereby claim their happiness. This ability to influence serves as a means of regulating emotions. Those who consider happiness, defined as all positive emotions, to be a matter of chance miss out on a lot. On the other hand, those who are convinced of their own happiness can rely on a strong sense of self-efficacy, which is associated with high values in mental health, life satisfaction, and happiness. Anna Bachem presents the psychological construct of happiness self-efficacy belief and offers initial suggestions for its targeted promotion.