In Old Mexico is a 1938 American Western film directed by Edward D. Venturini and written by Harrison Jacobs.

The film stars William Boyd, George "Gabby" Hayes, Russell Hayden, Paul Sutton, Al Ernest Garcia, Jan Clayton and Trevor Bardette.

[1][2] Hoppy (William Boyd) and his pals must journey to Mexico after receiving a summons.

Upon arrival, they realize that it was fake and that a good friend has been mysteriously murdered.

They solve the puzzle with the assistance of the killer's feisty sister and a band of helpful caballeros.