John Marshall Brown (October 3, 1926 – August 5, 1995) was an American politician and insurance agent from New Orleans, Louisiana, who served in the Louisiana House of Representatives from District 12 in his native Orleans Parish from 1952 to 1960. In 1959, Brown announced that he would run for governor of Louisiana, but he soon withdrew from the race ultimately won by former Governor Jimmie Davis. During the 1960s, Brown served on the Louisiana State Board of Education, an elected position, as the representative of Louisiana's 2nd congressional district.