An armed confrontation in Everett, Washington, between local authorities and members of the Industrial Workers of the World resulted in seven deaths.

The Everett massacre, also known as Bloody Sunday, was an armed confrontation between local authorities and members of the Industrial Workers of the World (IWW) union, commonly called "Wobblies". It took place in Everett, Washington, on Sunday, November 5, 1916. The event marked a time of rising tensions in Pacific Northwest labor history.

Everett is the county seat of and the most populous city in Snohomish County, Washington, United States. It is 25 miles (40 km) north of Seattle and is one of the main cities in the metropolitan area and the Puget Sound region. Everett is the seventh-most populous city in the state, with 110,629 residents as of the 2020 census. The city is primarily situated on a peninsula at the mouth of the Snohomish River along Port Gardner Bay, an inlet of Possession Sound, and extends to the south and west.

The Industrial Workers of the World (IWW), whose members are nicknamed "Wobblies", is an international labor union founded in Chicago, United States in 1905. Its ideology combines general unionism with industrial unionism, as it is a general union, subdivided between the various industries which employ its members. The philosophy and tactics of the IWW are described as "revolutionary industrial unionism", with ties to socialist, syndicalist, and anarchist labor movements.