thumb|Wedgwood Rock. The child holds a yardstick (0.9 meter long)
thumb|Map of Wedgwood Rock to [[Mount Erie (Washington)|Mount Erie. The glacial erratic was carried by the Vashon Glacier 14,000 years ago]]
Wedgwood Rock is a glacial erratic (known to geologists as the Wedgwood Erratic) near the neighborhood of Wedgwood in Seattle, Washington. Its mineral composition matches that of Mount Erie, on Fidalgo Island in Skagit County, Washington, north. Prior to the establishment of the Wedgwood neighborhood, the erratic was known first as Lone Rock and later simply as Big Rock. Transported to its site by the Puget Lobe of the Cordilleran Ice Sheet during the Vashon Glaciation more than 14,000 years ago, it was a landmark for Native Americans in what was once a dense forest.
Today, the rock sits in a residential neighborhood on 28th Avenue NE, near NE 72nd Street, still surrounded by trees and brush, and kept clear by local residents.
19th century
In 1881, the rock, known at the time as Lone Rock, was part of the farm of William Weedin. This rock has an estimated mass of .
In 1888 the Weedin property passed to Mary Miller, widow of William Miller. William Miller, an ally of Territorial Governor Isaac Stevens, fought in the Puget Sound War and Yakima War of 1856–1857.
20th century and later
By the early 20th century, the rock was known as Big Rock. With the Miller family's permission, members of Seattle's Mountaineers Club practiced their rock climbing techniques there. Edmond S. Meany, president of Mountaineers and a professor at the nearby University of Washington brought his students to the rock to learn about glacial movement and land forms. Later, Boy Scouts also learned to climb there, taught by German-born climber and scout leader Wolf Bauer. REI founder Lloyd Anderson taught Mountaineers and Boy Scouts at the rock. Among the prominent climbers whose training started at Big Rock were German-born Fred Beckey and Jim Whittaker, who became the first American to reach the top of Mount Everest.