Clancy is a census-designated place (CDP) in Jefferson County, Montana, United States. The population was 1,406 at the 2000 census. It is part of the Helena Micropolitan Statistical Area.
Clancy is located at 46°28′29″N 111°59′1″W / 46.47472°N 111.98361°W / 46.47472; -111.98361 (46.474638, -111.983497).
According to the United States Census Bureau, the CDP has a total area of 35.8 square miles (92.6 km²), all of it land.