The purpose of this study was to determine the mediating effect of general self-efficacy on the relationship between the transformational leadership of school heads and the organizational commitment of teachers. Utilizing quantitative, non-experimental design via correlational technique, data were obtained from 300 elementary public-school teachers who belong to the 3 districts, Magsaysay, Bansalan and Matan-ao under the Division of Davao Del Sur in the province of Davao Del Sur. The researcher utilized a stratified random sampling technique and an online survey mode of data collection. The researcher also utilized the statistical tools mean, Pearson r and Medgraph using Sobel z-test. From the results of the study, it was found out that there is a very high level of mean scores for transformational leadership of school heads, a very high level of the mean score for the organizational commitment of teachers and a high level of general self-efficacy for teachers. Also, results revealed that there are significant relationships between the transformational leadership of school heads and the organizational commitment of teachers, between the transformational leadership of school heads and general self-efficacy of teachers, and between general self-efficacy and organizational commitment of teachers. Further, it was revealed that there was a full mediation effect of general self-efficacy on the relationship between the transformation leadership of school heads and the organizational commitment of teachers.<p> </p><p><strong> Article visualizations:</strong></p><p><img src="/-counters-/soc/0025/a.php" alt="Hit counter" /></p>