Speaking is one of the important skills that should be mastered in learning English. One of the effective techniques to improve speaking skill was by using storytelling technique. Storytelling is an activity where some people re-tell a story that they have created. The purpose of this research was to investigate the effectiveness of storytelling on Junior High School students’ English speaking skill. This research used a quantitative method specifically quasi-experimental design.To attain the aim of this research, the participants took pre-test and post-test. The pre-test and post-test used to know the students’ English speaking skill. The populations of this research were eight grade students in one state Junior High School in Godean. The sample of this research consisted of 62 students (30 students in experimental class and 32 in control class). In experimental and control class the researcher taught seventh meetings, and the researcher used storytelling as the treatment. The result of this research indicated that there was significant difference between the mean score of the pre-test and post-test in experimental and control class. The mean score of gained score in experimental class was 8.50 and control class was -.62. The students’ speaking skill in experimental class improved. The result of independent sample test showed that 0.000<0.05 and 11.30>1.67068. It means that Ha was accepted and there was significant difference between students in experimental class and control class. It can be concluded that storytelling had significant improvement in speaking aspect.