This study is entitled TIKTOK AS A SUPPLEMENTARY INSTRUCTIONAL MATERIAL IN TEACHING FILIPINO AND COMMUNICATION SUBJECTS. This study aimed to determine the effectiveness of the TikTok application as an innovative supplementary instructional tool in teaching Filipino and Communication subjects to Secondary and Tertiary students in the academic year 2022-2023. The researcher utilized an experimental method to obtain the necessary data. Fifty (50) students participated as study respondents from the Southern Luzon State University-Main Campus and Laboratory School through Purposive Sampling Technique. Based on the data obtained, mental effectiveness, emotional effectiveness, and active learning are both very high. Therefore, the TikTok application effectively cultivated intellectual skills, self-esteem, active cultivation, and the application of knowledge gained by students. Regarding the outcome of the students preliminary examination level, it was scored as quite satisfactory, while the final examination was scored as satisfactory. It affirms that there is a significant difference in their level of performance. Thus, the hypothesis There is no significant difference in the performance level of the students based on the preliminary and final test was not accepted. Therefore, there was a significant difference in the scores obtained by the students, and TikTok became effective as an innovative approach and strategy in teaching Filipino and Communication subjects. The hypothesis There is no significant relationship between the use of TikTok as an innovative supplementary instructional tool in teaching Filipino subjects and students performance was not accepted. Therefore, there is a significant relationship between them. The videos developed using TikTok for students was an effective innovative supplementary material in teaching Filipino and Communication subjects. Teachers were encouraged to discover and utilize more innovative tools such as TikTok that could increase students engagement and their performance in their Filipino and Communication subjects. These techniques can contribute to developing a more conducive and fun learning process.