The Paléo Festival de Nyon, usually just called Paléo, is an annual rock festival held in Nyon, Switzerland. It started in a small way in 1976 as the Nyon Folk Festival. The first one was held in the village hall in Nyon. From 1977 until 1989, it was held at Colovray, Nyon, by Lake Geneva and had only two stages, but today it is one of the major open-air music festivals in mainland Europe and the biggest in Switzerland. Today the event has grown to include international artists. In 1990, it moved to its current location, at the Plaine de l'Asse, accessible either by walking, bus or the Chemin de fer Nyon-St-Cergue-Morez narrow-gauge railway.
The festival lasts six days at the end of July, from Tuesday to Sunday, and the final main stage concert is preceded by a great firework display with music.
As of 2005, 3.5 million spectators and 2500 artists had been part of the Paléo Festival.