Augustus Summerfield Merrimon (September 15, 1830 – November 14, 1892) was a Democratic U.S. senator from the state of North Carolina between 1873 and 1879.

He briefly served in the Confederate Army when the American Civil War broke out, but resigned to become solicitor (prosecutor) for North Carolina's eighth judicial district.

After the war, Merrimon served as a state superior court judge, then returned to the practice of law, and was an unsuccessful Democratic (at the time, officially called the Conservative Party) candidate for Governor of North Carolina in 1872.

With 49.5 percent of the vote, Merrimon lost an extremely close race to incumbent Tod R. Caldwell.

During his term in the Senate, Merrimon gained a reputation as "one of the bitterest partisan Democrats in Congress" (New York Times, October 14, 1878).