Courthouse Towers, Rock formation in Arches National Park, Utah, US

Courthouse Towers is a group of tall sandstone monoliths and fins in Arches National Park, north of Moab, Utah. The towers are carved from salmon-coloured Entrada Sandstone, with buff-coloured Navajo Sandstone visible in layer-cake fashion around them. The Organ, a sheer fin, stands beside the cluster, and the Moab Fault is exposed near the park visitor centre.

The towers are made of salmon-coloured Entrada Sandstone, about 140 million years old, laid down above a thick salt bed that shifted and faulted the rock into fins and monoliths. Arches was first designated a national monument on April 12, 1929, and redesignated a national park on November 12, 1971.

The name comes from the resemblance of the tall sandstone pillars to courthouses, a comparison made by early observers crossing the open desert. The cluster stands near the park's main road, and the columns are among the first large formations seen by drivers entering from the visitor center. The Organ, one of the towers, appears on older maps as an alternate name for the group.

The Park Avenue Trail starts at a parking area off the park road and descends through a dry wash between the towers, ending near the Courthouse Towers viewpoint; most walkers arrange a shuttle or retrace the route uphill. The surface is uneven slickrock and gravel with little shade, so carry water and avoid the exposed midday heat.

The towers stand in a section of Arches National Park where the park's defining Entrada Sandstone is exposed in layer-cake fashion alongside the buff-colored Navajo Sandstone. The park holds more than 2,000 natural sandstone arches, the highest density of such arches in the world.