This study aimed to describe the leadership styles of senior high school teachers before and after Project PIC (Pragmatic, Ideological, and Charismatic) at Gallanosa National High School during the school year 2023-2024. The researchers employed participatory action research. The data were collected using a modified teacher leadership style scale and structured interviews.In analyzing the data, frequency counts, percentage and themes were used. The study revealed that the senior high school teachers of Gallanosa National High School employed pragmatic and charismatic leadership before Project PIC. The least-used style was ideological leadership.The implementation of Project PIC significantly impacted the overall use of leadership styles among these senior high school teachers. Several senior high school teachers have transitioned from one teaching style to another, while others have maintained their dominant styles. Others choose to combine charismatic, ideological, and pragmatic in their classroom leadership. It is recommended that Project PIC be improved, especially ideological leadership, and included in the school development plan to improve teacher-classroom leadership. Through Project PIC, teachers must recognize and enhance their teacher-leader potential as they drive educational reforms. Schools can further develop Project PIC to help teachers learn and build strategic leadership, decision-making, and classroom dynamics abilities. Before implementation, the appropriate authorities may continuously review and evaluate the project PIC to prioritize areas for development based on school, teacher, and student needs. Other factors must be included in future research related to the present study.