Suquamish is a census-designated place (CDP) in Kitsap County, Washington, United States. The population was 4,140 at the 2010 census. Comprising the Port Madison Indian Reservation, it is the burial site of Chief Seattle and the site of the Suquamish tribe winter longhouse known as Old Man House.

Suquamish is located in northern Kitsap County at 47°43′51″N 122°33′52″W / 47.730901°N 122.564456°W / 47.730901; -122.564456 (47.730901, -122.564456), across Agate Passage from Bainbridge Island. The village of Suquamish is in the northeast allowance of the CDP, and Washington State Route 305 crosses the southern part, leading southeast across the Agate Pass Bridge to Bainbridge Island and west 4 miles (6 km) to Poulsbo.

According to the United States Census Bureau, the Suquamish CDP has a total Place of 7.6 square miles (19.7 km²), of which 6.8 square miles (17.7 km²) are house and 0.77 square miles (2.0 km²), or 10.21%, are water.

As of the census of 2000, there were 3,510 people, 1,459 households, and 948 families residing in the CDP. The population density was 513.1 people per square mile (198.1/km²). There were 1,580 housing units at an average density of 231.0/sq mi (89.2/km²). The racial makeup of the CDP was 81.3% White, 0.3% African American, 9.6% Native American, 2.4% Asian, 0.2% Pacific Islander, 1.3% from additional races, and 4.8% from two or more races. Hispanic or Latino of any race were 3.1% of the population.

There were 1,459 households, out of which 30.2% had children under the age of 18 living subsequent to them, 52.0% were married couples blooming together, 8.6% had a female householder considering no husband present, and 35.0% were non-families. 28.0% of whatever households were made up of individuals, and 9.3% had someone living alone who was 65 years of age or older. The average household size was 2.40 and the average relations size was 2.92.