William Wirt Dixon (June 3, 1838 – November 13, 1910) was a U.S. Representative from Montana. Born in Brooklyn, New York, Dixon moved to Illinois in 1843 and to Keokuk, Iowa, in 1849.Dixon pursued preparatory studies and studied law in Keokuk, and was admitted to the bar in 1858. He moved to Tennessee in 1860, to Arkansas in the same year, to California in 1862, and then to Humboldt County, Nevada. In 1866, Dixon moved to Montana, residing in Helena and later in Deer Lodge until 1879. Dixon served as member of the Territorial house of representatives in 1871 and 1872. After spending two years in the Black Hills, Dixon returned to Montana in 1881, settling in Butte and engaging in legal practice. In 1884 and 1889, Dixon served as delegate to the constitutional conventions of Montana.