Helena Valley Northwest is a census-designated place (CDP) in Lewis and Clark County, Montana, United States.

According to the United States Census Bureau, the CDP has a total area of 16.4 square miles (42 km2), all land.

There were 769 housing units at an average density of 47.0 per square mile (18.1/km2).

14.7% of all households were made up of individuals, and 2.4% had someone living alone who was 65 years of age or older.

Helena High School District covers the entire CDP.