Nolwenn Le Magueresse (French pronunciation: [nolwɛn lə maɡəʁɛs]; born 28 September 1982), known by her stage name Nolwenn Leroy (pronounced [nolwɛn ləʁwa]), is a French musician and actress.

Originally classically trained (violin and opera singing), she rose to fame after winning the second season of the French television music competition Star Academy in 2002. She has since recorded eight studio albums and scored two number one singles, "Cassé" and "Nolwenn Ohwo!", on the French charts. In 2012, her album Bretonne was certified two times diamond for sales exceeding one million copies.

Leroy is fluent in English, having spent a year in the United States as an exchange student. She sings in many languages, including French, Breton, English and Irish.

Leroy has received numerous awards and nominations. In January 2015, she was ranked 17th on Le Journal du Dimanche's 50 Most Loved Celebrities in France, making her the top female singer on the list since December 2012. She was appointed an Officer of the Order of the Arts and Letters by the French Ministry of Culture in 2021.