Abiathar Peak, Mountain summit in Yellowstone National Park, United States.

Abiathar Peak is a mountain summit reaching approximately 10,928 feet in the northeastern section of Yellowstone National Park within the Absaroka Range of Wyoming. The peak rises above the forested valleys below, offering views across the surrounding mountain landscape.

The peak was named in 1885 by members of the Hague Geological Survey after Charles Abiathar White, a geologist who conducted early surveys in the western United States. This naming coincided with the period when scientists were intensively mapping the geology of the Yellowstone region.

The name Abiathar Peak honours Charles Abiathar White, a geologist and paleontologist on early western surveys who never visited Yellowstone. Members of the 1885 Hague Geological Survey chose the name. The peak sits east of its better-known neighbour, Barronette Peak, in the Absaroka Range.

Abiathar Peak lies in the northeast corner of Yellowstone, a few kilometres southwest of Cooke City, Montana, and is reached on foot; no road or trail leads to the summit. The approach crosses Absaroka Range terrain, so carry a map and compass and plan for snow that lingers at 3,331 metres. Barronette Peak rises just to the west.

The peak honors Charles Abiathar White, a geologist and paleontologist of the early western surveys, yet White never visited Yellowstone. Members of the 1885 Hague Geological Survey chose his name for the summit, which rises east of and across from the better-known Barronette Peak.