Daniel Milton Newhouse is an American politician and agricultural scientist serving as the U.S. representative for Washington's 4th congressional district. The district covers much of the central third of the state, including Yakima and the Tri-Cities. Before his election to Congress, Newhouse served as director of the Washington State Department of Agriculture and as a member of the Washington House of Representatives. He is a member of the Republican Party.

Washington's 4th congressional district encompasses a large area of central Washington, covering the counties of Douglas, Okanogan, Grant, Yakima, Benton, and Klickitat; and parts of Adams and Franklin counties. The district is dominated by the Yakima and Tri-Cities areas. With a Cook Partisan Voting Index rating of R+11, it is the most Republican district in Washington.