The purpose of this study is to examine the role of Leadership Styles on Organizational Effectiveness by using data obtained from 86 full time employees of Minaye PLC and Deluxe. The sample was made up of full time, Leaders and employee of 126 Population. Two survey questionnaire instruments were used to collect the data. A multiple linear regression model was applied to study and analyze the data. Generally, the results support to theories that hypothesize leadership styles play a significant role in determining organizational effectiveness. Transformational Leadership style has been positively linked to organizational effectiveness; The results support arguments for adopting the transformational leadership style, and each of its dimensions, to reverse the decline of and enhance levels of organizational effectiveness for Minaye PLC and Deluxe. Limitations of the study were discussed, as well as suggestions of the findings. Finally, recommendations for future research were given