High Rock is a hill in Nipissing District of Northeastern Ontario, Canada, located 24 km (15 mi) southwest of the village of Temagami.

The highest point on High Rock Island, it is one of many scenic viewpoints on Lake Temagami.

The lookout at the north end of High Rock Island is a Nipissing diabase dyke.

The lookout at the top was used as a watch tower by the ancestors of the Teme-Augama Anishnabai to detect if Iroquois were coming from the north or the south.

The 1930s creation of the Skyline Reserve meant that trees within 90 meters of shore would not be cut, so commercial logging never occurred on the island.