Gunther Castle is a 7,199-foot-elevation (2,194-meter) summit located in the Grand Canyon, in Coconino County of northern Arizona, US.

Topographic relief is significant as it rises nearly 4,500 feet (1,400 meters) above the Colorado River in three miles.

[2] The top dome of Gunther Castle is composed of lower strata of the Pennsylvanian-Permian Supai Group.

[6] Precipitation runoff from Gunther Castle drains east to the nearby Colorado River via Chuar and Kwagunt Creeks.

The first ascent of Gunther Castle was made by Alan Doty, Doc Ellis, Donald Davis, and Harvey Butchart in June 1969.