"Perfekte Welle" (), was the name of the first single of German pop/rock group Juli. It was the first release from their album, Es ist Juli, and peaked at number two in the German and Austrian single charts.
In December 2004, after the tsunami in south-east Asia, many German television and radio stations announced that they would no longer play the song as a mark of respect to the tsunami victims.
The song was released as a playable on-disc track in the European version of Rock Band and as a downloadable track in North America.
An Afrikaans version was released in South Africa by the group [http://www.shine4.co.za Shine4], called "Perfekte Wêreld" (Perfect World).