The New California Republic (often abbreviated as the NCR) is one of two major factions in Fallout: New California. It is a federal constitutional republic occupying the territory of the former US State of California. The NCR emphasizes, and claims to support, a myriad of old world values such as democracy, personal liberty, and the rule of law. It also strives to restore general order to the Wasteland, funneling its time and energy into the improvement and development of post-war infrastructure and economic systems. The NCR tries to establish (and at times, enforce - though it prefers not to act in the role of police force unless necessary) an environment of basic common peace and lawful conduct among its citizens, of whom it requires regular taxation in exchange for its services.

Though appearing to be a benevolent entity of governance, the ability to control the land that it claims to protect, the fidelity of those who live under its rule, and the widespread corruption within its political system has been questioned by many, without a clear response from the NCR themselves.