The 2011 Prix de l'Arc de Triomphe was a horse race held at Longchamp on Sunday 2 October 2011.

The winner was Danedream, a three-year-old filly trained in Germany by Peter Schiergen.

[2] Danedream was the second German-trained horse to win the "Arc".

The winning time of 2m 24.49s set a new record for the event.

The previous record of 2m 24.60s was achieved by Peintre Celebre in 1997.