Rock en Seine (French pronunciation: [ʁɔk ɑ̃ sɛn]) is a three-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).

• 2003: Birth of Rock en Seine on 27 August, with two stages and ten bands.
• 2004: The festival extends over two days. It welcomes new artistic forms with Rockfolio, Rock en Strophes and Rock en Clips.
• 2005: The festival site gets bigger: the third stage appears, as well as a campsite.
• 2007: The festival extends over three days.
• 2010: 105 000 people attending to this edition.
• 2011: The fourth stage is emerging.
• 2014: 120 000 people attending to this edition. The new stage named "Ile-de-France" hosts the Avant-Seine's bands.
• 2017: Sarah Schmitt becomes the new director of the festival. The festival welcomes a "Firestone" stage.

• 2003: 1st year, 2 stages, 10 artists, 22,000 spectators
• 2004: 2nd year, extended to Two days, 22 artists, 48,000 spectators
• 2005: 3rd year, Three stages, 30 artists, 46,000 spectators
• 2006: 4th year, Three stages, 30 artists, 57,000 spectators
• 2007: 5th year, extended to Three days, 45 artists, 68,000 spectators
• 2008: Three stages, 34 artists, 76,000 spectators
• 2009: Three stages, 47 artists, 97,000 spectators
• 2010: Three stages, 47 artists, 105,000 spectators
• 2011: Four stages, 63 bands, 105,000 spectators
• 2012: Four stages, 62 artists, 108,000 spectators
• 2013: Four stages, 56 artists, 110,000 spectators
• 2014: Five stages, 65 artists, 120,000 spectators
• 2015: Five stages, 66 artists, 110,000 spectators
• 2016: Five stages, 65 artists, 110,000 spectators
• 2017: Six stages, 78 artists, 110,000 spectators
• 2018: Six stages, 78 artists, 90,000 spectators (to confirm)
• 2019: Five stages, 62 artists, 100,000 spectators
• 2022: Five stages, 58 artists, 150,000 spectators

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.

The park and the garden were designed by Le Nôtre in the 17th century, and it is the first park to be classed as a Monument historique in 1994. It is a 4.6 km² park, and there are gardens and forest with basins, thickets, cascades, and statues.

In 2005, for its third edition, and with the support of Ile-de-France, Rock en Seine inaugurated "Avant-Seine", a selection of bands from Ile-de-France which join the official programming of the festival. Every year, six selected groups are playing on a stage, and one of their tracks is published on a compilation spread for free.

• 2005: Stuck in the Sound, Flying Pooh, HushPuppies, Herman Düne, Sayag Jazz Machine, Hopper.
• 2006: Rhesus, Dead Pop Club, Daddy Longlegs, Neïmo, French Paradoxe, Fancy.
• 2007: Housse de Racket, Hey Hey My My, Nelson, Pravda, Rodeo Massacre, I Love UFO.
• 2008: Narrow Terence, Brooklyn, The Latitudz, Molecule, Da Brasilians, Fortune.
• 2009: Lilly Wood & The Prick, Hindi Zahra, Cheveu, Gush, Jil Is Lucky, The Tatianas.
• 2010: Success, King of Conspiracy, I Am Un Chien, Quadricolor, Viva & the Diva, Roken is Dodelijk.
• 2011: Frànçois and The Atlas Mountains, Concrete Knives, The Feeling of Love, Myra Lee, Beat Mark, Birdy Hunt.
• 2012: Granville, Owlle, Yeti Lane, The Lanskies, Versus, Hyphen Hyphen.
• 2013: FAUVE, Team Ghost, FI/SHE/S, J.C. Satàn, St. Lô, Wall Of Death.
• 2014: ALB, Dorian Pimpernel, Feu! Chatterton, Jessica93, PEGASE, Petit fantôme.
• 2015: DBFC, VKNG, Forever Pavot, We Are Match, Jeanne Added, Last Train.
• 2016: KillASon, O, Adrien Soleiman, Kaviar Special, Maestro, Théo Lawrence & The Hearts.
• 2017: Inuït, Barbagallo, Gracy Hopkins, Lysistrata, Therapie Taxi, Rendez-Vous.
• 2018: 8 In Bloom, La Veine, Lily, Yanse, The Cage, Moons