This study is aimed to find out classifications and to describe functions of directive speech acts in Friday sermon at Al-Fitrah mosque of Walisongo State Islamic University of Semarang. This research was descriptive qualitative which the writer interprets of utterances that contain the types and funtions of directive speech acts. In this research, the writer used the credibility type to check the research validity. To test credibility the writer applied increasing perseverance and triangulation ways. The result of this study showed that 33 utterances of directive speech acts were succesfully identified. There are command (7 data or 21,2%), request (1 data or 3.0%) and suggestion (25 data or 75,8%). So it can be concluded that the dominant directive is suggestion. It means that the speaker gives suggestion to the hearers to do something in the stright ways so that the hearers can be good moslem.