Rock en Seine (French pronunciation: [ʁɔk ɑ̃ sɛn]) is a multiple-day rock music festival, held at Domaine National de Saint-Cloud, the Château de Saint-Cloud's park, west of Paris, inside the garden designed by André Le Nôtre.

The name is a pun, based on exactly the same pronunciation in French of the words scène meaning 'stage' and Seine (the river separating Saint-Cloud from Central Paris after which the Hauts-de-Seine département is called).

[2] The festival takes place in the down of the Park of "Domaine national de Saint-Cloud", a historical place at the gates of Paris, and five minutes from the nearest subway station, métro Boulogne - Pont de Saint-Cloud.

It is a 4.6 km2 park, and there are gardens and forest with basins, thickets, cascades, and statues.

Every year, six selected groups are playing on a stage, and one of their tracks is published on a compilation spread for free.