Billings County is a county in the U.S. state of North Dakota. As of the 2020 census, the population was 945, making it the second-least populous county in North Dakota. Its county seat and only incorporated place is Medora.

Medora is a city in Billings County, North Dakota, United States. The only incorporated place in Billings County, it is also the county seat. Much of the surrounding area is part of either Little Missouri National Grassland or Theodore Roosevelt National Park. The population was 121 at the 2020 census. It is part of the Dickinson Micropolitan Statistical Area.