This study tried to investigate the effectiveness of authentic and pedagogical films with English and Persian subtitles in learning vocabulary. Moreover, the role of these two types of subtitles and the films with no subtitles were investigated. To conduct the study, 30 Iranian EFL students were selected based on the results of an Oxford Placement Test and were assigned in two experimental groups as authentic and pedagogical groups. The students were given twelve sessions as treatment. Then, the researcher administered a post-test at the end of the treatment period. The post-test was a multiple choice test with 25 items. To answer the research questions statistical analysis was performed. The results of t-test showed that the students in authentic group had a better performance than the students in the pedagogical group in vocabulary learning. Regarding the findings of One-way ANOVA and post-hoc Tukey test, revealed that the students who received films with English subtitles had a better performance in comparison to groups of students who watched films with Farsi subtitles or those watched films with no subtitles.