Gustavo "Gus" Alberto Barreiro (July 12, 1959 – August 16, 2019) was a Republican politician from Florida. He served four terms in the Florida House of Representatives, representing the 107th district in Miami-Dade County from 1998 to 2006. His district encompassed parts of Miami, Miami Beach, and Coral Gables. In 2012, Barreiro ran for the Florida House again, but lost the Republican primary in the 112th district to Alex Díaz de la Portilla, 59 to 41%. He died after a heart attack in 2019.