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 Glacial erratic boulders of King County are large glacial erratic boulders of rock which were moved into King County, Washington by glacial action during previous ice ages.
 The Pleistocene ice age glaciation of Puget Sound created many of the geographical features of the region, including Puget Sound itself, and the erratics are one of the remnants of that age. According to Nick Zentner of Central Washington University Department of Geological Sciences, "Canadian rocks [are] strewn all over the Puget lowland, stretching from the Olympic Peninsula clear over to the Cascade Range." Erratics can be found at altitudes up to about 1,300–1,600 feet (400–490 m) in the Enumclaw area, along with kames, drumlins, and perhaps also the unique Mima mounds. The soil of Seattle, the county's (and state's) largest city, is approximately 80% glacial drift, most of which is Vashon glacial deposits (till), and nearly all of the city's major named hills are characterized as drumlins (Beacon Hill, First Hill, Capitol Hill, Queen Anne Hill) or drift uplands (Magnolia, West Seattle). Boulders greater than 3 meters in diameter are "rare" in the Vashon till, but can be found, as seen in the table below.
 47°35′31.1″N 121°59′27.0″W﻿ / ﻿47.591972°N 121.990833°W﻿ / 47.591972; -121.990833﻿ (Beaver Lake Preserve erratics)
 47°43.542′N 121°59.189′W﻿ / ﻿47.725700°N 121.986483°W﻿ / 47.725700; -121.986483﻿ (Big Rock (Duvall))
 47°36′00″N 122°02′49″W﻿ / ﻿47.600°N 122.0469°W﻿ / 47.600; -122.0469﻿ (Big Rock Park erratic)
 Saved from destruction by sit-in conducted by Cascadia College environmental politics students, and relocated away from construction site. The rock, which several students occupied during the sit-in, was about 2 meters across before being jackhammered to two thirds its original size.
 47°45′38″N 122°11′20″W﻿ / ﻿47.76059°N 122.18886°W﻿ / 47.76059; -122.18886﻿ (Cascadia College erratic)
 8 by 6 by 4.5 feet (2.4 m × 1.8 m × 1.4 m)
 47°24.250′N 122°19.848′W﻿ / ﻿47.404167°N 122.330800°W﻿ / 47.404167; -122.330800﻿ (Des Moines Beach erratic)
 Four or more erratics on beach below Discovery Park. Largest is 15.33 feet (4.67 m) high, 69.5 feet (21.2 m) in circumference.
 47°40.124′N 122°25.210′W﻿ / ﻿47.668733°N 122.420167°W﻿ / 47.668733; -122.420167﻿ (Discovery Park beach erratics)
 47°31′48.9″N 122°4′49.7″W﻿ / ﻿47.530250°N 122.080472°W﻿ / 47.530250; -122.080472﻿ (Fantastic Erratic)
 Native Americans called the rock LE'plEpL, also written La'pub, and also called it Tele'tla (meaning "rock"). A legend says that a hero named Sta'kub could throw a giant cedar and hazel branch dragnet over the rock while standing at the beach.
 47°38′20″N 122°24′48″W﻿ / ﻿47.63889°N 122.41333°W﻿ / 47.63889; -122.41333﻿ (Four Mile Rock)
 47°23′14″N 122°18′06″W﻿ / ﻿47.38730°N 122.30173°W﻿ / 47.38730; -122.30173﻿ (Highline CC)
 47°37′57.8″N 122°10′46.3″W﻿ / ﻿47.632722°N 122.179528°W﻿ / 47.632722; -122.179528﻿ ('Homage' boulders (NE 24th)) (NE 24th)
47°38′47″N 122°09′52″W﻿ / ﻿47.6463°N 122.1644°W﻿ / 47.6463; -122.1644﻿ ('Homage' boulders (NE 40th)) (NE 40th)
47°39′38″N 122°09′12″W﻿ / ﻿47.6605°N 122.1533°W﻿ / 47.6605; -122.1533﻿ ('Homage' boulders (NE 60th)) (NE 60th)
 47°36′04″N 122°17′20″W﻿ / ﻿47.60103°N 122.28897°W﻿ / 47.60103; -122.28897﻿ (Leschi Park erratic)
 47°29.94′N 121°58.17′W﻿ / ﻿47.49900°N 121.96950°W﻿ / 47.49900; -121.96950﻿ (Lone Rock)
 47°40′19″N 122°18′25″W﻿ / ﻿47.67183°N 122.30689°W﻿ / 47.67183; -122.30689﻿ (Ravenna Park erratic)
 47°31′07.1″N 121°59′49.2″W﻿ / ﻿47.518639°N 121.997000°W﻿ / 47.518639; -121.997000﻿ (Talus Rocks)
 47°42′14″N 122°18′37″W﻿ / ﻿47.70389°N 122.31028°W﻿ / 47.70389; -122.31028﻿ (Thornton Creek erratic)
 47°40′51″N 122°17′50″W﻿ / ﻿47.68084°N 122.2973°W﻿ / 47.68084; -122.2973﻿ (Wedgwood Rock)
 47°41′18″N 122°17′41″W﻿ / ﻿47.6882°N 122.2948°W﻿ / 47.6882; -122.2948﻿ (Wedgwood Square erratic)