Terry, incorporated in 1910, is a town in and the county seat of Prairie County, Montana, United States. The population was 605 at the 2010 census. Terry became a two-railroad town when the Milwaukee Road constructed a transcontinental line known as the Pacific Extension through the town in the early 20th century. The Custer Creek train wreck, the worst rail disaster in Montana history, occurred near Terry along this line in 1938.
The Terry Badlands WSA and the Evelyn Cameron Museum attract visitors from all over the World every year. The guest registry in the Evelyn Cameron muesuem has entries from as far away as Europe, Asia, and Africa. Efforts to increase ecotourism include an Americorps VISTA project to create a trail network for hikers and campers in the surrounding badlands. The Terry Badlands Trails Project encourages the Leave No Trace principles.