Law of the Pampas is a 1939 American Western film directed by Nate Watt and written by Harrison Jacobs. The film stars William Boyd, Russell Hayden, Sidney Toler, Steffi Duna, Sidney Blackmer, Pedro de Cordoba and William Duncan. The film was released on November 3, 1939, by Paramount Pictures. Hungarian-born Steffi Duna plays a convincing Argentine senorita and Sidney Toler plays a comic character. Contrary to previously published reports, David Niven does not appear in Law of the Pampas, unbilled or otherwise.