Nuestra Familia is a criminal organization of Mexican American (Chicano) prison gangs with origins in Northern California. While members of the Norteños gang are considered to be foot soldiers of Nuestra Familia, being a member of Nuestra Familia itself does not signify association as a Norteño. Some law enforcement agents speculate that the Nuestra Familia gang, which operates in and out of prisons, influences much of the criminal activity of thousands of Norteño gang members in California. The gang's main sources of income are distributing cocaine, heroin, marijuana, and methamphetamine within prison systems as well as in the community and extorting drug distributors on the streets.

Norteños are the various, affiliated gangs that pay tribute to Nuestra Familia while in California state and federal correctional facilities. Norteños may refer to Northern California as Norte Califas. Their biggest rivals are the Sureños from Southern California. As of 2008, the statewide north–south dividing line between Norteños and Sureños was regarded as running through the southern end of the Central Valley. The gang's membership consists primarily of Mexican Americans.