"Un monde parfait" ("A Perfect World" in English) is a 2005 song recorded by French young artist Ilona Mitrecey. Based on a traditional Neapolitan song, it was the first single from her debut album Un monde parfait and was released on 28 February 2005. It was immediately a very big hit in France and Belgium (Wallonia), where it remained for several months atop of the chart, thus becoming one of the biggest-selling singles there. It was also released in many other European countries and achieved success, in Switzerland, Austria, Portugal and Germany where it was a top three hit. It was the best-selling single of the 21st century in France, with 1.5 million copies sold. Ilona was only 10 years old when she sang the song.