Mark Welson Chua (November 30, 1981 - March 18, 2001) was a Filipino student of the University of Santo Tomas whose death is widely believed to be linked to his exposé of alleged irregularities in the Reserve Officers' Training Corps unit of the university. His death became the catalyst for the passage of Republic Act 9163 or the "National Service Training Program Law", which removed completion of mandatory ROTC as a precondition for graduation for male college students in the Philippines.