Geyser is a small, unincorporated rural village in Judith Basin County, Montana, United States, southeast of Great Falls along U.S. Route 87.

According to the U.S. Census Bureau, the Geyser CDP has an area of 0.89 square miles (2.3 km2), all of it recorded as land.

[5] The community sits on a low bench between McCarthy Creek to the east and Crow Coulee to the west.

NB: For Census Bureau study purposes, the village was incorporated within a census-designated place (CDP) in or after 1980.

Demographic data extracted from Census Bureau documents after that time will reflect on the entire CDP, not just the village proper.