The attention to servant leadership has increased in the recent years and different kinds of business, profit, educational and even governmental organizations have used servant leadership principles for managing their organizations. But doubts have been raised in regard to the effectiveness of implementing servant leadership for organizational effectiveness, especially, in governmental organizations. In the light of mixing Iranian culture with the goals of servantitude and importance of the topic, this article is concerned to test the effect of servant leadership on organizational effectiveness of Iranian governmental organizations through the two ways of leadership and followership effectiveness. For this purpose, after problem statement and reviewing the literature, the factors and the variables of theoretical research model was recognized and the respected questions were distributed among the managers and employees of 22 Iranian public organizations. T- student test was employed for examining the whole status of research dimensions. For testing the hypotheses, statistical tests of regression and Spearman correlation were employed. In examininig the relation between research dimensions, all of the relationships under study were verified. But the low score obtained for the mean of servant Leadership Measuring Instrument (OLA) in comparison to average mean explained that servant leadership is exercised weakly in Iranian public organizations while paternalistic leadership dominated them. Also the weak relationship of realization of organizational effectiveness through servant leadership - followership effectiveness denotes thelack of necessary attention to the followers and their role in organizational effectiveness. Finally, some suggestions are offered according to the results.