Groom Lake, Salt lake in Lincoln County, Nevada, United States.

Groom Lake is a dry salt flat in Groom Lake Valley, part of the Tonopah Basin in Lincoln County, Nevada. It measures 3.7 miles (6.0 km) north to south and 3 miles (4.8 km) east to west at its widest point, with a circumference of about 11.3 miles. The pale, flat surface serves as runways for the Nellis Bombing Range Test Site airport (KXTA), part of the Area 51 installation.

Mining activities near the site began in 1864 after the discovery of lead and silver deposits in the southern Groom Range. The dry lake surface was later used for aviation testing and developed into a major military testing facility.

The facility at the lake appears in many television series, films, and video games exploring theories about classified military research. The area remains a popular subject for stories about aviation technology and government operations.

Tikaboo Peak, located 26 miles (42 kilometers) to the east, offers the nearest legal viewing point for photographers and interested visitors. Access to the lake surface itself is restricted and the area is designated as a military exclusion zone.

Groom Lake lies within Groom Lake Valley, part of the Tonopah Basin, about 25 miles (40 km) south of Rachel, Nevada. Two closer viewpoints, nicknamed "Freedom Ridge" and "White Sides", were closed to public access in 1995 to stop people photographing the installation.