Joliet is a town in Carbon County, Montana, United States. It is part of the Billings, Montana Metropolitan Statistical Area. The population was 595 at the 2010 census.

There were 260 households of which 28.8% had children under the age of 18 living with them, 48.1% were married couples living together, 11.9% had a female householder with no husband present, 3.5% had a male householder with no wife present, and 36.5% were non-families. 32.3% of all households were made up of individuals and 19.2% had someone living alone who was 65 years of age or older. The average household size was 2.29 and the average family size was 2.91.

The median age in the town was 41.1 years. 24.9% of residents were under the age of 18; 5.9% were between the ages of 18 and 24; 22.7% were from 25 to 44; 27% were from 45 to 64; and 19.7% were 65 years of age or older. The gender makeup of the town was 50.4% male and 49.6% female.