BACKGROUND: Improving Occupational Health and Safety performance has become a challenge for industry, because investing in technology, equipment, or robust management systems has not been enough to prevent accidents in the workplace. With the expansion of commercial relations and the intensification of competitiveness in the global market, leadership is essential to prevention. OBJECTIVE: Evaluate leadership in occupational safety through a case study. METHODS:The leadership training methodology "The seven steps of leadership and worker involvement" was adapted and applied. Data collection was conducted through the application of diagnosis, training, and monitoring of the evolution of the leadership performance in the management of occupational safety via structured interviews, monitoring of accidents and statistical analysis of the data. RESULTS: Research has shown that assertive leadership behavior positively influences performance in the management of occupational safety and the results of this case study showed a reduction in accidents with injuries of more than 50%. CONCLUSIONS: Evidence shows that there is a correlation between safety leadership behavior and the reduction in the occurrence of accidents.