John C. Stennis (August 3, 1901 – April 23, 1995) was an American politician who served as a U.S. Senator from the state of Mississippi. He was a Democrat who served in the Senate for over 41 years.
Stennis served in the Senate from 1947-1989. He was a supporter of racial segregation. He signed the Southern Manifesto, which called for massive resistance to the Supreme Court ruling in Brown v. Board of Education. He also voted against the Civil Rights Act of 1964, the Voting Rights Act of 1965, and the Civil Rights Act of 1968. He supported the extension of the Voting Rights Act in 1982 but voted against the establishment of Martin Luther King Jr. Day as a national holiday.