Vaillancourt Fountain, sometimes called Quebec libre!, is a large fountain in Embarcadero Plaza in San Francisco, designed by the Québécois artist Armand Vaillancourt in 1971. It is about 40 feet (12 m) high and is constructed out of precast concrete square tubes. Long considered controversial because of its stark, modernist appearance, there have been several unsuccessful proposals to demolish the fountain over the years. It was the site of a free concert by U2 in 1987, when lead singer Bono spray painted graffiti on the fountain and was both praised and criticized for the action.

Embarcadero Plaza, previously known as Justin Herman Plaza from its opening in 1972 until 2017, is a 1.23-acre (0.50 ha) plaza near the intersection of Market and Embarcadero in San Francisco's Financial District, in the U.S. state of California. It is owned by Boston Properties, who acquired the neighboring Embarcadero Center office, hotel, and retail complex in 1998.