| Age | 78 (age at death) |
| Birthday | 13 August, 1811 |
| Birthplace | St. Marys, Georgia, U.S. |
| Died | 15 December, 1889 |
| Place of Death | Winchester, Tennessee, U.S. |
| Zodiac Sign | Leo |
William Johnson Copp (August 13, 1811 – December 15, 1889) was an American lawyer, Republican politician, and Wisconsin pioneer. He was one of the founders of Pierce County, Wisconsin, and served as the first Pierce county judge. He also served in the Wisconsin Senate (1868 & 1869) and State Assembly (1866), representing much of northwestern Wisconsin.
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