The 1999 Seattle WTO protests, sometimes referred to as the Battle of Seattle, were a series of anti-globalization protests surrounding the WTO Ministerial Conference of 1999, when members of the World Trade Organization (WTO) convened at the Washington State Convention and Trade Center in Seattle, Washington on November 30, 1999. The Conference was to be the launch of a new millennial round of trade negotiations.

The WTO Ministerial Conference of 1999 was the third Ministerial-level meeting of the World Trade Organization, convened at the Washington State Convention and Trade Center in Seattle, Washington, USA, over the course of four days, from Tuesday, 30 November 1999 to Friday, 3 December 1999. Anti-globalization activists organized large-scale protests of the meeting, sometimes known as the Battle of Seattle. Direct action tactics forced the WTO Ministerial Conference to begin late on 30 November and contributed to the meeting ending without agreement on 3 December.