The International Longshore and Warehouse Union (ILWU) is a labor union which primarily represents dock workers on the West Coast of the United States, Hawaii, and in British Columbia, Canada; on the East Coast, the dominant union is the International Longshoremen's Association. The union was established in 1937 after the 1934 West Coast Waterfront Strike, a three-month-long strike that culminated in a four-day general strike in San Francisco, California, and the Bay Area. It disaffiliated from the AFL–CIO on August 30, 2013.

A dockworker is a waterfront manual laborer who is involved in loading and unloading ships.