Worden is a census-designated place (CDP) in Yellowstone County, Montana, United States. The population was 582 at the 506 at the 2020 census. Worden, along with Ballantine, Huntley, and Pompey's Pillar, is part of the Huntley Project, an irrigation district established by the United States Bureau of Reclamation in 1907.

Yellowstone County is the most populous county in the U.S. state of Montana. As of the 2020 census, the population was 164,731. Its county seat is Billings, the state's most populous city. Like the nearby park, Yellowstone County is named after the Yellowstone River which roughly bisects the county, flowing southwest to northeast. The river, in turn, was named for the yellow sandstone cliffs in what is now Yellowstone County.