Hiester Clymer (November 3, 1827 – June 12, 1884) was an American politician and white supremacist from the state of Pennsylvania.

Although Clymer was born in Pennsylvania, he was adamantly opposed to Abraham Lincoln's administration and the Republican Party's prosecution of the American Civil War.

After the American Civil War ended, Clymer unsuccessfully ran for the Pennsylvania Governor's office in 1866 on a white supremacist platform against Union Major-General John W. Geary.

In the controversial campaign, Clymer's camp produced some of the most virulently graphic racist posters and pamphlets of the decade.

He died in Reading, Pennsylvania, on June 12, 1884, by suicide as a result of what one newspaper account called "financial embarrassment.