Elmo (Salish: sqʷʔeʔ, Kutenai: k̓upawi¢q̓nuk[3]) is a census-designated place (CDP) in Lake County, Montana, United States.

[5] Elmo had a dock and warehouse that served boat traffic on Flathead Lake.

According to the United States Census Bureau, the Elmo CDP has a total area of 0.3 square miles (0.78 km2), all land.

The racial makeup of the CDP was 31.47% White, 67.83% Native American, and 0.70% from two or more races.

25.0% of all households were made up of individuals, and 9.6% had someone living alone who was 65 years of age or older.