Despite significant interest in corporate culture, there is little empirical research on its role in influencing corporate misconduct. Using cultural background information on key company insiders, I construct a measure of corporate corruption culture, capturing a firm's general attitude toward opportunistic behavior. Firms with high corruption culture are more likely to engage in earnings management, accounting fraud, option backdating, and opportunistic insider trading. I further explore the inner workings of corruption culture and find evidence that it operates both as a selection mechanism and by having a direct influence on individual behavior.