Pompey's Pillar is an unincorporated community in Yellowstone County, Montana, United States.
Founded in 1907, Pompey's Pillar was built and named after the site of a famous natural landmark where William Clark inscribed his name on July 25, 1806 during his trip down the Yellowstone River. The landmark is a sandstone outcropping.
The village was planned as a railroad station within the Huntley Project, an irrigation project managed by the United States Bureau of Reclamation.
A Catholic church and a Union Congregational church once existed in the village. The Northern Pacific Railroad connected the settlement to Billings, about 29 miles southwest. A post office currently operates in the community.
Pompeys Pillar National Monument was created in 2001. The site is controlled by the Bureau of Land Management.
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