Entrepreneurial intentions are typically theorized to precede entrepreneurial action. However, many people do not followthrough on intentions. This raises questions regarding the link between ADHD (Attention Deficit/Hyperactivity Disorder) and entrepreneurship. On the one hand, individuals with ADHD may be among the least likely to follow-through on intentions. Alternatively, ADHD may facilitate entrepreneurial behavior, since action is prepotent. With a sample of over 9800 individuals, we tested potential links between actual ADHD, entrepreneurial intentions, action, and flow. The clinical condition of ADHD positively predicted not just entrepreneurial intentions, but also entrepreneurial action. Our results replicate and extend recent findings linking ADHD and entrepreneurship, using the stricter conceptualization of actual ADHD (a clinical diagnosis). In spite of downsides, ADHD enhances the odds of entrepreneurial action.