Woodstock 40 Years On: Back to Yasgur's Farm is a six-CD live box-set album of the 1969 Woodstock Festival in Bethel, New York. Its release marked the 40th Anniversary of the festival.

Woodstock Music and Art Fair, commonly referred to as Woodstock, was a music festival held from August 15 to 18, 1969, on Max Yasgur's dairy farm in Bethel, New York, 40 miles (65 km) southwest of the town of Woodstock. Billed as "an Aquarian Exposition: 3 Days of Peace & Music" and alternatively referred to as the Woodstock Rock Festival, it attracted more than 460,000 attendees. Thirty-two acts performed outdoors despite overcast and sporadic rain. It was one of the largest music festivals in history and became synonymous with the counterculture of the 1960s.