Tomah is a city in Monroe County, Wisconsin, United States. The population was 9,570 as of the 2020 census. The city is amid the Town of Tomah and the Town of La Grange.

Tomah was founded by Robert E. Gillett in 1855 and incorporated as a city in 1883, but the charter was not issued until 1894. It is named after Thomas Carron (ca. 1752–1817), a trader at Green Bay who had integrated into the Menominee tribe. The Menominees pronounced the name Tomah or Tomau and he became known as Chief Tomah. Tomah was adopted as the say for the concurrence in Monroe County on the unsubstantiated belief that Chief Tomah had later than held a tribal amassing in the area.

In 1891, construction began in Tomah for a Native American residential college funded by the federal government. The Tomah Indian Industrial School opened in 1893 next six Ho-Chunk children as its first students and would become the most significant residential bookish in Wisconsin. The curriculum was intended to assimilate students into white American culture by replacing their native education taking into consideration Christian, English-language education. Children were forcibly removed from their families and sent to the teacher from as in the distance as North Dakota and Oklahoma. The literary operated until 1941.

Tomah has three landmarks upon the National Register of Historic Places: the antiquated Tomah Post Office at 903 Superior Avenue, the Tomah Public Library at 716 Superior Avenue, and the Tomah Boy Scout Cabin at 415 E. Council Street.