| Alexander M. Thomson | |
| Order: | 19th |
| Office: | Speaker of the Wisconsin Assembly |
| Term Start: | January 6, 1868 |
| Term End: | January 3, 1870 |
| Predecessor: | Angus Cameron |
| Successor: | James M. Bingham |
| State1: | Wisconsin |
| State Assembly1: | Wisconsin |
| District1: | Rock 5th |
| Term Start1: | January 6, 1868 |
| Term End1: | January 3, 1870 |
| Predecessor1: | Pliny Norcross |
| Successor1: | Alexander Graham |
| Party: | Republican |
| Birth Date: | 20 May 1822 |
| Birth Place: | Pittsburgh, Pennsylvania, U.S. |
| Death Place: | Milwaukee, Wisconsin, U.S. |
| Restingplace: | Union Cemetery, |
| Spouse: | Emeline L. Thomson (died 1892) |
Alexander McDonald Thomson (May 20, 1822June 9, 1898) was an American journalist, historian, and Republican politician. He served as the 19th Speaker of the Wisconsin State Assembly (1868 - 1870). In historical documents, he is sometimes referred to as A. M. Thomson or A. McD. Thomson.
Thomson was born in Pittsburgh, Pennsylvania, in 1822 to immigrants from Scotland and Holland.[1] [2] His family moved to Ohio when he was a child.[1] He moved to Hartford, Wisconsin, in 1848[1] and to Janesville, Wisconsin, in 1864. From 1870 to 1873, he was editor of the Milwaukee Sentinel. Thomson also authored A Political History of Wisconsin.[3] He died in Milwaukee in 1898.[1]
Thomson was speaker of the Assembly from 1868 to 1869. In addition, he was sergeant at arms of the Assembly from 1864 to 1870. He was a Republican.