The Woman in the Septic Tank (Filipino: Ang babae sa septic tank) is a 2011 Filipino comedy film directed by Marlon Rivera, written by Chris Martinez, and starring JM De Guzman, Kean Cipriano, Cai Cortez and Eugene Domingo. The film follows three aspiring filmmakers who set out to make a film for the sole purpose of receiving international recognition and awards.

The Woman in the Septic Tank was submitted as the Philippines' official entry for the 2011 Academy Awards for Best Foreign Film, and was an entry for the 2011 Cinemalaya Festival. It was produced by Martinez-Rivera Films and Quantum Films. The film was released on August 3, 2011, by Star Cinema and grossed 38.4 million pesos and was the highest grossing Filipino independent film at the time until it was surpassed in 2015 by That Thing Called Tadhana.