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Recent growth of English as an international language of communication highlights the importance of speaking which everyone needs to use in a multiplicity of contexts. Scholars have shown that concept mapping increases vocabulary learning, and organization of knowledge. However, its impact on enhancing speaking fluency is overlooked. This research project investigates the effect of concept mapping on speaking fluency of Iranian intermediate EFL students. To achieve its purpose, the following research question was proposed: Does concept mapping have any statistically significant effect on speaking fluency of the aforementioned students? 80 second term EFL university students were randomly selected and were randomly assigned to a control and experimental group. We employed concept mapping in the experimental group for twenty two sessions. When the treatment was over a proficiency test was administered to the students as a post-test. The distributions of scores for each variable by all subjects were examined and the results showed that concept mapping had statistically significant effect on speaking fluency of intermediate EFL students.