This study examined the effectiveness of a Cooperative Storytelling through Role-Playing strategy in enhancing the Filipino oral fluency of Grade 5 learners at Marcos P. Estoque Elementary School. Using the Speaking Fluency Measurement Rubric (SFMR), the strategy addressed common oral fluency difficulties by providing varied situations through text and pictures. A total of 30 students identified with low oral fluency participated in a three-week intervention involving interactive activities focused on pronunciation, vocabulary, content development, and idea construction. The procedure involved three phases: a pre-test to assess baseline skills using the SFMR, implementation of the Cooperative Storytelling through Role-Playing strategy, and a post-test to evaluate learning outcomes. Data were analyzed using descriptive statistics and a paired sample t-test to determine the effectiveness of the intervention. Results indicated a substantial improvement in Filipino oral fluency, with the average score increasing from 28.45% to 78.93% after the intervention showing a statistically significant difference t (29) = 16.2, p <.001). and a large effect size (Cohens d = 2.95). Qualitative data from student interviews revealed that the strategy not only improved fluency but also increased confidence, interest in learning Filipino, and the practical application of speaking skills. The findings suggest that Cooperative Storytelling through Role-Playing, supported by the Speaking Fluency Measurement Rubric, is an effective approach for enhancing oral fluency. It is recommended that teachers integrate this strategy into their instructional methods to provide regular, engaging opportunities that foster oral fluency development and create a more dynamic learning environment.