Belfry is a census-designated place (CDP) in Carbon County, Montana, United States.

It is an unincorporated town, and is part of the Billings, Montana Metropolitan Statistical Area.

The primary crops are sugar beets, alfalfa, and feed corn.

At its peak in the early 1900s, a railway line came into Belfry, with a spur running up to the coal mines in Bearcreek.

When the mines closed down and the railway line was removed, Belfry's population dropped to its current level.

[3] The Clarks Fork of the Yellowstone River runs just east of the main part of the town.

The racial makeup of the CDP was 98.63% White, 0.91% Native American, and 0.46% from two or more races.