Byron Leslie Dorgan (born May 14, 1942) is the junior United States Senator from North Dakota. He is a member of the North Dakota Democratic-NPL Party, the North Dakota affiliate of the Democratic Party. In the Senate, he is Chairman of the Democratic Policy Committee and Chairman of the Committee on Indian Affairs.

Dorgan was born in Dickinson, North Dakota, the son of Dorothy (née Bach) and Emmett Patrick Dorgan, and was raised in Regent, North Dakota. He graduated from Regent High School and earned a Bachelor of Science from the University of North Dakota in 1964 and an Master of Business Administration from the University of Denver in 1966.

Dorgan worked in management for a Denver aerospace firm, eventually earning a position training others for high ranking company positions.