This study mainly determined the effectiveness of carousel brainstorming in the teaching of speaking to the Grade 11 students of Don Vicente Rama Memorial National High School during the school year 2019-2020. A quasi-experimental design was used where the whole class of Grade 11 students taking up Oral Communication subject was made to answer the researcher-made questionnaires in a form of mock job interview before the carousel brainstorming strategy was implemented. After the implementation, they underwent another set of mock job interview to identify whether or not the aforementioned strategy was effective. Findings show that the students’ speaking proficiency during the pretest denotes they need improvement in the four components, namely: vocabulary, pronunciation, fluency and organization of ideas. On the other hand, the posttest results of the students’ speaking proficiency reveal great improvement. It could be inferred that the intervention was effective for the enhancement of the students’ speaking ability. Given this result, the lesson guides integrating the aforementioned strategy is highly recommended to be utilized in teaching Oral Communication. Therefore, carousel brainstorming is a student-centered, classroom-based, and active learning strategy that promotes higher-order thinking, social interaction and cooperative learning.