Perc? Rock (or Rocher Perc?) is a limestone monolith in the Bay of St. Lawrence. It is located off the tip of the Gasp? Peninsula, 750 km east of Qu?bec City, near its namesake, the town of Perc?.

It is a massive limestone stack 433 metres (1420 ft) long, 90 metres (296 ft) wide, and 88 metres (289 ft) at its highest point. The rock gets its name from a large 15 metre (50 ft) high arch near its seaward end. There were actually two arches in the rock in the past, until the outer arch collapsed on June 17, 1845.

Together with Bonaventure Island, Perc? Rock is part of the provincial Parc national de l'?le-Bonaventure-et-du-Rocher-Perc?.

For four hours at a time during low tide, the water recedes from a wide spit of land that allows the rock itself to be visited by foot. Perc? Rock is a major tourist attraction in Quebec, with picturesque views of the rock from both Perc? and nearby Bonaventure Island. It contains millions of marine fossils such as trilobites, tetracoralla, brachiopods and ostracods from the Devonian period.

As of May 2008, access to Perc? Rock is only permitted when accompanied by a guide. Parcs Quebec has more information.