Woodstock was a music festival, billed as An Aquarian Exposition, held at Max Yasgur's 600 acre (2.4 km²; 240 ha) dairy farm in the rural town of Bethel, New York from August 15 to August 18, 1969. Bethel (Sullivan County) is 43 miles (69 km) southwest of the village of Woodstock, New York, in adjoining Ulster County.

The festival exemplified the counterculture of the late 1960s – early 1970s and the "hippie era". Thirty-two of the best-known musicians of the day appeared during the sometimes rainy weekend in front of nearly half a million concertgoers. Although attempts have been made over the years to emulate the festival, the original event has proven to be unique and legendary. It is widely regarded as one of the greatest moments in popular music history and was listed on Rolling Stone's 50 Moments That Changed the History of Rock and Roll.

The event was captured in a successful 1970 documentary movie, Woodstock an accompanying soundtrack album and Joni Mitchell's song "Woodstock", which commemorated the event and became a major hit for Crosby, Stills, Nash & Young.