Proper Dos is an American hip hop group formed in early 90s in California, composed of rapper Frank Villareal and producer Ernie Gonzalez.

The duo released their debut album, Mexican Power, in 1992 through Skanless Records, which peaked at #32 on the Billboard Top Heatseekers.

However, Proper Dos has also had help on some recordings by special guests including Big Shady, Lil Rob, Point Blank, Royal T, Knightowl and others.

The release of Mexican Power was supported by several singles, including "One Summer Night", "Life of a Gangster", "No Turning Back" and "Hard Time".

In 2000, Proper Dos appeared on the Low Profile Records compilation, Brown Pride Riders, Vol.