National Heritage Area Act of 2012 - Establishes a system of National Heritage Areas through which the Secretary of the Interior may provide technical and financial assistance to local coordinating entities to support the establishment, development, and continuity of the National Heritage Areas. Provides for such system to be composed of National Heritage Areas designated by Congress before enactment of this Act or under this Act.
Prohibits National Heritage Areas from being: (1) considered to be units of the National Park System, or (2) subject to the authorities applicable to such units.
Specifies the criteria that the Secretary shall apply to determine the suitability and feasibility of designating proposed National Heritage Areas. States that designation of a National Heritage Area shall be by Act of Congress and contingent on the prior completion of a management plan and an affirmative determination by the Secretary that the area meets such criteria.
Sets forth requirements for National Heritage Area management plans.