This article examines how the leadership styles of union representatives and immediate supervisors can influence workers' commitment to both their union and organization. The researchers hypothesize that transformational leadership from both union representatives and supervisors will positively influence workers' perception of the workplace relations climate, while laissez-faire leadership will negatively influence it. A positive workplace relations climate is then expected to lead to dual commitment among workers to both their union and organization. The study aims to contribute to understanding how relational factors like leadership styles can shape workplace relations climate and dual commitment, beyond traditional structural explanations. It is based on a survey of 834 unionized workers in the Canadian aerospace industry.