Batas ng .45 () is a 1991 Filipino action film directed by Fernando Poe Jr. (under the pseudonym Ronwaldo Reyes), who also stars in the film, from a screenplay written by Pablo S. Gomez, Erwin Castillo, and Chris Michelena, with the latter two writers co-wrote the story. Co-starring Timmy Cruz, Paquito Diaz, Charlie Davao, R.R. Herrera, and Tito Arevalo, the story follows a former police officer who, after being dishonorably discharged under unsubstantiated circumstances, orchestrates a campaign of retribution against the officials responsible for the conspiracy in an effort to prove his innocence.
Produced and distributed by Chiba Far East Film International, the film was theatrically released on May 30, 1991.
Batas ng .45 was produced by Chiba Far East Film International, founded by the film's executive producer, Jaime M. Garcia, a former stuntman. Timmy Cruz, who was under a contract with Viva Films at the time, was allowed by its top executive, Vic R. Del Rosario Jr., to be cast in the lead female role.