The Suquamish people (soo-KWAH-mish; Lushootseed: suq̓ʷabš /ˈsoqʼʷɑbʃ/) are a Southern Coast Salish people Indigenous to western Washington state. Historically, the Suquamish dominated much of northeastern Kitsap Peninsula, with their main village, dxʷsəq̓ʷəb, being located at what is today Suquamish, Washington. They are politically succeeded by the Suquamish Indian Tribe, a federally recognized Native American tribe that governs the Port Madison Indian Reservation.

The Suquamish were deeply affected by both smallpox epidemics and raids from more northern Indigenous peoples like the Cowichan and Lekwiltok in the 18th and 19th centuries. In the early 19th century, they were led by Kitsap, who met with George Vancouver's expedition in 1792. Around 1825, Kitsap led the Suquamish and other Indigenous peoples from Puget Sound in a region-spanning coalition against the Cowichan, who had long been targeting the region with slave raids, ultimately losing the battle but ending Cowichan raids in the future. After Kitsap's death, Challacum became the preeminent leader of the Suquamish, who continued Kitsap's policy of friendliness with European traders. Seattle led the Suquamish and Klallam in a major raid against the neighboring Chemakum, killing most of them. He would later become the leader of the Suquamish after Challacum, and was recognized as head chief of the Suquamish and other tribes during the treaty process of the Treaty of Point Elliott in 1855.

The Point Elliott treaty created the Port Madison reservation in their territory, on which the Suquamish continued to live. During this period, they faced cultural repression from the policies of assimilation of the United States government and changes in the traditional culture and social organization. Traditional Suquamish life was dominated by seasonal cycles of fishing, hunting and gathering, based from permanent winter villages. They maintained close ties with groups such as the Twana and Duwamish as they travelled to summer grounds, but fishing and canning industries in the 20th century threatened this lifestyle. In the 1960s, the Suquamish organized into the modern Suquamish Indian Tribe, which continues Suquamish political sovereignty today.

The name "Suquamish" is from suq̓ʷabš, the name for the Suquamish people in their language, Lushootseed. The name is from the root √suq̓ʷ and the suffix =abš, 'people'.

The name suq̓ʷabš is often translated to mean "people of the clear saltwater". This translation derives from dxʷsəq̓ʷəb (variously xʷsəq̓ʷəb), the name for the site of the main Suquamish village on Agate Pass. According to early-20th-century anthropologist T. T. Waterman (who recorded many place names around Puget Sound between 1918 and 1920), the meaning of the name probably arose from the contrast of the slow-moving and turbid water of Liberty Bay as compared to the swift-moving and clear tide water flowing through Agate Pass.

This is most likely a folk etymology according to anthropologists and linguists Nile R. Thompson and William W. Elmendorf. Elmendorf instead posited a Twana-language origin for the name suq̓ʷabš. According to Elmendorf's Twana informants, the name came from the Twana word wuq̓ʷatəb, 'drifted away' (cf. Twana swuq̓ʷabəš 'Suquamish'). They believed that most Suquamish were unaware of the Twana etymology of their name, since the word for drift in Lushootseed is p̓əq̓ʷ. Additionally, Thompson noted that in Twana oral history, there is a story about how after a great flood, the ancestors of the Suquamish drifted away eastward to their homeland on Agate Pass, which he argued supports the Twana origin theory.

The Suquamish have also been called ʔitakʷbixʷ, 'mixed people' (anglicized as Itakmahu or Etakmur) by other groups such as the Snohomish. This name could have referred to the Suquamish as having many connections, or it could have been a derogatory nickname questioning the ancestry of the noble families of the Suquamish.

The English name "Suquamish" in the past has been spelled variously as Soquamish, Soquam, Swuwkwabsh, and Suqabsh.