This study aims to examine the impact of diversity among the members of top management team (TMT) on financial performance of manufacturing firms. Diversity components of the top management team were divided into two categories of managerial background variables (age, gender, background, education, work skills), and managerial areas (industrial and international). In addition, financial performance indicators included ROA, ROI, ROS, sales growth, assets growth and market share growth. The statistical population of the study consisted of 210 listed companies in Saveh Industrial Complex in Markazi Province in Iran, among which questionnaires were distributed. However, only 89 questionnaires were collected, which were considered the sample size of the research. Findings show positive impact of the top management team diversity in terms of gender, work skills, education, international experience and work experience on financial performance. Finally, the research has also presented theoretical and executive solutions and recommendations.