Josiah D. Arnold (November 1, 1820 – March 10, 1903) was an American businessman, Democratic politician, and Wisconsin pioneer.

Arnold served as clerk of the Wisconsin Circuit Court for Columbia County in 1848 and 1849.

[1] He moved back to Janesville and was in the real estate and insurance business.

Arnold died at his home in Janesville, Wisconsin from heart problems.

This article about a Democratic Party member of the Wisconsin State Assembly is a stub.