Robert Paul Griffin (November 6, 1923 – April 16, 2015) was an American politician.
A member of the Republican Party, he represented Michigan in the United States House of Representatives and United States Senate and was a Justice of the Michigan Supreme Court.
He co-sponsored the Landrum-Griffin Act, which regulates the internal affairs of labor unions.
As a deputy minority leader in the Senate, he called on President Richard Nixon to resign during the Watergate scandal.