Steilacoom may refer to:

• Steilacoom people, an historical Coast Salish tribe who lived near the Puget Sound
• Steilacoom Tribe of Indians, a contemporary heritage group, unrecognized as a tribe

• Fort Steilacoom, a former US Army outpost near Lake Steilacoom
• Fort Steilacoom Park, the largest park in Lakewood, Washington
• Lake Steilacoom, a lake in Pierce County, Washington, approximately 2.5 miles southwest of Tacoma, Washington
• Steilacoom Creek, an older name for Chambers Creek, in Washington State
• Steilacoom, Washington, a town in Pierce County, Washington
• Colloquially, in Washington State, "Steilacoom" is also used to refer to Western State Hospital, although the hospital is actually in the neighboring city of Lakewood, Washington