Alpha Kappa Omega Batch '81 (also known as Batch '81 or ΑΚΩ 81) is a 1982 Filipino psychological drama film directed by Mike de Leon, with a screenplay by de Leon, Clodualdo del Mundo, Jr., and Raquel Villavicencio. The film depicts the titular fraternity's harsh initiation of new batch members as seen through the eyes of pre-med student Sid Lucero, played by Mark Gil in what is generally recognized as his breakout role.