Charles Cotesworth Pinckney Arndt (October 31, 1811 – February 11, 1842) was an American lawyer, Whig politician, and Wisconsin pioneer.

While serving as a member of the Council of the Wisconsin Territory, he was shot and killed by fellow councillor, James Russell Vineyard.

On February 11, 1842, Arndt was involved in a heated debate on the floor of the Council chamber with James Russell Vineyard, of Grant County.

[2] Arndt was giving passionate support to Enos S. Baker, Governor Doty's nominee to serve as sheriff of Grant County.

[3] During the debate, Arndt produced a number of testimonials from Grant County voters attesting to the quality of Baker's character, which Vineyard declared to be false.