The more competitive balance is among teams comprising league, the harder predicting the games is, resulting in more attractive league. An attractive competition leads to selling more tickets, more capitalizing on TV broadcast and attracting more and better sponsors. Purpose: The purpose of this research is to investigate changes of competitive balance in Iran pro league from 1995 to 2010. Data are secondary derived from the final tables of 1995-2010. Methodology: Data analysis was based on C5ICB index. The more C5ICB is, the less balanced league is. Therefore, C5ICB is inversely related to competitive balance. Results and conclusions: For easier analysis, the findings of research have been presented as 3 five year periods; First five years (1995-2000): 128, second five years (2000-2005): 131, third five years (2005-2010): 129.6. It had the most balance in first five years.. Sever competition leads to high quality of league and function of teams. Iranian national team's entrance to 1998 world competitions can be one of consequences of high balance in league then. C5ICB demonstrates least balance in second five years. In this period, there was no success in national team nor clubs. Competitive balance of recent period has increased in comparison to previous period. In this period, four teams were champions. Entrance of 2 teams from Isfahan, 1 team from Kerman and only 1 team from Tehran to competitions of Asian champion league shows vanishing traditional state (bipolar) of football in Iran (concentrated in Tehran) and developing rapidly in all parts of Iran. These cities are industrial and profit from financial support of industrial sectors. But this is suitable in short term and some clubs don't have such financial support so can't compete with industrial clubs and afford their expenses. In fact, professionalism is financial independence. In Iran, football clubs receive no money from TV broadcast so running them privately is difficult. If a budget is provided by gov
