Northern Tier

Northern Tier may refer to:


 * Northern Tier (Pennsylvania), five northern counties in Pennsylvania
 * Northern Tier (United States), the northernmost confine of the lower 48 United States
 * Northern Tier National High Adventure Bases, of the Boy Scouts of America
 * Northern Tier Energy, an American business partnership created in 2010
 * Northern Tier, a Cold War term from 1955–1979 for the four Middle Eastern members of the Baghdad Pact, also known as the Central Treaty Organization: Turkey, Iraq, Iran and Pakistan.