Longueur d'ondes (Wavelength) is the fifth studio album recorded by the Canadian singer Natasha St-Pier, and was released on 13 January 2006.

[1] It achieved a great success in France, topping the albums and digital charts: It was also successful in Belgium, Poland and Switzerland.

The album's lead single, "Un ange frappe à ma porte", was the most-played French single across the world during 2006.

[2] + "Un ange frappe à ma porte" (video)