Robert Emmet Hayes (born February 11, 1951) is an American lobbyist and politician who represented the 7th Plymouth District in the Massachusetts House of Representatives from 1983 to 1991. In the late 1980s Hayes sponsored legislation to help Massachusetts cities and towns meet the requirements of the federal Clean Water Act. Hayes' legislation, the Massachusetts Clean Water Act, resulted in a State Revolving Fund which allocated $900 million in no-interest loans for planning, design or construction of waste-water projects in 85 Massachusetts communities.