Mario Rafael Díaz-Balart Caballero is an American politician serving as the U.S. representative for Florida's 26th congressional district. A Republican, he was elected in 2002, and his district includes much of southwestern Miami-Dade County, including Hialeah, and much of the northern portion of the Everglades.

Florida's 26th congressional district is an electoral district for the U.S. Congress, which was first created in South Florida in 2013 as a result of Florida's population gain in the 2010 census. In the 2020 redistricting cycle, it was drawn as a successor to the previous 25th district and includes most of inland Collier County as well as the northwestern suburbs of Miami, including Doral, Hialeah, Miami Lakes, and some neighborhoods in Miami itself, such as Allapattah and Wynwood. The previous iteration of the 26th district, which included Monroe County and the southwestern suburbs of Miami, was instead renamed as the newly-created 28th district.