David Joseph Weber (December 20, 1940 – August 20, 2010) was an American historian whose research focused on the history of the Southwestern U.S. and its transition from Spanish and Mexican control to becoming part of the United States. For a period of time, this field of study had largely been ignored, as both United States and Latin American historians concentrated on the central stories in their fields. He "was among the first scholars to focus on the importance of the relationship between Mexico and the United States."