This dissertation is a study on the leadership styles of union leaders in the Nigerian National Union of Food, Beverage, and Tobacco Employees (NUFBTE). Unionism is very active in Nigeria, and union leaders have continued to play a key role in the nation’s economic and sociopolitical agenda. The study examined the leadership styles of union leaders based on the perceptions of union members, using Bass and Avolio’s 2004 full transformational model. Through quantitative methods, the relationship between the leadership styles of union leaders and the commitment and satisfaction of union members was analyzed. Bass and Avolio’s Multifactor Leadership Questionnaire 5X was used in the study to obtain the leadership behaviors of union leaders and to determine the satisfaction of the members. The Union Commitment Scale developed in 1992 by Kelloway, Catano, and Southwell was used to obtain information on the commitment of union members to the union. The study showed that union leaders in the Nigerian NUFBTE exhibited both transactional and transformational leadership behaviors. The findings of the study supported the theory that there is a positive and statistically significant relationship between transformational leadership styles of union leaders and satisfaction.