Pompey's Pillar may refer to:
* Pompey's Pillar (column), an ancient column in Alexandria, Egypt
* Pompeys Pillar National Monument, a large rock formation in Montana, USA, named after a member of the Lewis and Clark Expedition
* Pompey's Pillar, Montana, an unincorporated community in Montana, named after the rock formation
* Pompeys Pillar (South Australia), a mountain in Wilpena Pound
* The Pillar of Pompey, an ancient altar on the European side of the Symplegades
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