Tamms is a village in Alexander County, Illinois, United States. The population was 430 at the 2020 census, down from 632 at the 2010 census. It is part of the Cape Girardeau–Jackson, MO-IL Metropolitan Statistical Area.

Alexander County is the southernmost and southwesternmost county in the U.S. state of Illinois. As of the 2020 census, the population was 5,240. Its county seat is Cairo and its western boundary is formed by the Mississippi River.