An estimated over 10 million people protested the war in Iraq in February of 2003, making it the largest protest ever “The February 15, 2003 anti-war protest was a coordinated day of protests across the world in which people in more than 600 cities expressing 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.””
Sources vary in their estimations of the number of participants involved. According to BBC News, between six and ten million people took part in protests in up to sixty countries over the weekend of the 15th and 16th; other estimates range from eight million to thirty million.
Some of the largest protests took place in Europe. The protest in Rome involved around 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 1½ million people protesting the invasion of Iraq; Mainland China was the only major region not to see any protests on that day, but small demonstrations, attended mainly by foreign students, were seen later”