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

Helena West Side is located in southern Lewis and Clark County.

U.S. Route 12 runs through the community, leading east 3 miles (5 km) to downtown Helena and west over the Continental Divide 40 miles (64 km) to Interstate 90 at Garrison.

There were 768 housing units at an average density of 52.1 per square mile (20.1/km2).

28.7% of all households were made up of individuals, and 9.2% had someone living alone who was 65 years of age or older.

Helena High School District covers the entire CDP.