| Josiah Arnold | |
| Order: | 16th |
| Mayor of Portage, Wisconsin | |
| Term Start: | April 1877 |
| Term End: | April 1881 |
| Predecessor: | William W. Corning |
| Successor: | Andrew Jackson Turner |
| State1: | Wisconsin |
| State Assembly1: | Wisconsin |
| District1: | Columbia 1st |
| Term Start1: | January 7, 1878 |
| Term End1: | January 6, 1879 |
| Predecessor1: | David Owen |
| Successor1: | Charles Randall Gallett |
| Office2: | Register of Deeds of Columbia County, Wisconsin |
| Term Start2: | January 6, 1851 |
| Term End2: | January 3, 1853 |
| Predecessor2: | F. F. Farnham |
| Successor2: | William Owen |
| Party: | Democratic |
| Birth Date: | 1 November 1820 |
| Birth Place: | Washington, Massachusetts, U.S. |
| Death Place: | Janesville, Wisconsin, U.S. |
| Restingplace: | Oak Hill Cemetery, |
Josiah D. Arnold (November 1, 1820March 10, 1903) was an American businessman, Democratic politician, and Wisconsin pioneer. He was the 16th mayor of Portage, Wisconsin (1877 - 1881), and represented Columbia County in the Wisconsin State Assembly for the 1878 session.
Arnold was born in Washington, Berkshire County, Massachusetts. Arnold moved to Janesville, Wisconsin Territory, in 1843. He then moved to Columbus, Columbia County, Wisconsin Territory in 1846 and finally moved to Portage, Wisconsin in 1852. Arnold was a merchant and lumber dealer. Arnold served as clerk of the Wisconsin Circuit Court for Columbia County in 1848 and 1849. He then served as register of deeds for Columbia County in 1851 and 1852. Arnold was a Democrat. From 1854 to 1858, Arnold served on the Portage Common Council. In 1877, Arnold served as mayor of Portage. In 1878, Arnold served in the Wisconsin Assembly.[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.[2] He was buried at Oak Hill Cemetery in Janesville.[3]