ABSTRACTEntrepreneurial success strongly depends on decision‐making under uncertainty. Uncertainty is particularly pronounced when entrepreneurs are confronted with novel situations characterized by an absence of information. While cognitive biases, such as overprecision, can have a negative impact on decision‐making processes by distorting information‐processing, self‐regulated entrepreneurial learning (SREL) has been found to be beneficial when navigating the uncertain entrepreneurial environment, but its potential to calibrate overprecision remains unclear. This study addresses this gap by investigating whether an SREL intervention can calibrate overprecision, a highly detrimental form of overconfidence in entrepreneurship.