David McCann "Mac" Sweeney (September 15, 1955 – July 21, 2024) was an American lawyer, businessman, and politician who served as a Republican member of the United States House of Representatives from Texas from 1985 to 1989.

Rogers and began a long-term association with another well-known Texan, James A. Baker III, then the White House Chief of Staff.

In 1984, he unseated Democratic U.S. Representative William Neff "Bill" Patman in one of the nation's closest congressional elections.

After his final unsuccessful campaign, Sweeney entered the private practice of law on Wall Street with the international firm Curtis, Mallet-Prevost, Colt & Mosle before later heading two businesses in New Jersey and Texas involved in successful restructurings or turnarounds.

A large number of the 400-plus Christians, Muslims and Copts trained and funded by the Sweeney family continue to work today in Syria, Tunisia, Bahrain, Lebanon and Sudan primarily with schools, clinics, job training, micro-business and tent making enterprises.