On 15 February 2003, a coordinated day of protests started across the world in which people in more than 600 cities expressed opposition to the imminent Iraq War.

It was part of a series of protests and political events that had begun in 2002 and continued as the war took place. Social movement researchers have described the 15 February protest as “the largest protest event in human history”.

Almost every country worldwide took part in the antiwar demonstration in Europe it included: the Alpine countries,
Benelux, Bosnia, and Herzegovina, Croatia, Cyprus, Czech Republic, France, Germany, Greece, Hungary, Ireland, Italy, Malta, Scandinavia, Poland, Portugal, Russia,, Serbia, Slovakia, Spain, Turkey, Ukraine, and United Kingdom.

In the Americas, the countries included: Canada; the United States (including New York City and other U.S. cities), Mexico, Uraguay. In Asia and West Asia  Iraq (Baghdad),  Syria, Lebanon, and Jordan. There were demonstrations in the African continent, including South Africa, and in Tunisia. The Oceanic part of the world included Fiji; Australia, New Zealand and further south Antarctica too.

Some of the largest protests took place in Europe. The Protest in Rome attracted three million people, and is listed in the 2004 Guinness Book of World Records as the largest anti-war rally in history. Madrid hosted the second largest rally with more than 1.5 million people protesting the invasion of Iraq.