The Eldorado Mountains, also called the El Dorado Mountains, are a north-south trending mountain range in southeast Nevada bordering west of the south-flowing Colorado River; the endorheic Eldorado Valley borders the range to the west, and the range is also on the western border of the Colorado River's Black Canyon of the Colorado, and El Dorado Canyon on the river.

The Nelson Overlook is a viewing point over the Colorado River's El Dorado Canyon.

Creosote bush, scrub oak, clump grass, and various cacti cover the mountains and foothills.

The high point of the Eldorado Mountains is Ireteba Peak at 5,060 feet (1,542 m), which is named for the Mohave Indian guide and tribal leader Irataba.

Nelson is in the center of the range, and the nearest community north is Boulder City.