Opposition to United States involvement in the Vietnam War began with demonstrations in 1964 against the escalating role of the United States in the Vietnam War and grew into a broad social movement over the ensuing several years. This movement informed and helped shape the vigorous and polarizing debate, primarily in the United States, during the second half of the 1960s and early 1970s on how to end the war.

Throughout the years Magnum Photographers documented the growing opposition to the war and captured the peace movement within USA and rest of the world.