Alexander Mitchell (October 17, 1817 – April 19, 1887) was a Scottish-born banker, railroad financier and Democratic politician in Milwaukee.

With fellow director Jeremiah Milbank (1818–1884) he built this railroad into one of the most profitable in the United States, and Mitchell became the wealthiest person in Wisconsin.

Mitchell owned a mansion across the street from the Milwaukee County Courthouse, which is now the site of the Wisconsin Club.

In World War II, the United States liberty ship SS Alexander Mitchell was named in his honor.

The Mackie Building, which was constructed by Mitchell as an investment property, is listed on the National Register of Historic Places.