Post Office Hill () is a prominent hill in Antarctica, 430 m, standing 4 nautical miles (7 km) northwest of The Knoll and overlooking the Adelie penguin rookery of Cape Crozier, Ross Island. Mapped and so named by the New Zealand Geological Survey Antarctic Expedition (NZGSAE), 1958–59, because the ship Discovery, in January 1902, left messages attached to a pole in a cairn of rocks in the rookery for the relief ship Morning.
This article incorporates public domain material from the United States Geological Survey document "Post Office Hill" (content from the Geographic Names Information System).