Luis Alfonso Rodríguez López-Cepero (born April 15, 1978), known by his stage name Luis Fonsi (Spanish pronunciation: [ˈlwis ˈfonsi]), is a Puerto Rican singer. He is known for his soulful and dance oriented songs, most notably 2017's "Despacito".

Fonsi received his first Latin Grammy Award nominations in the Record of the Year category and won Song of the Year thanks to the song "Aquí Estoy Yo". The song also won three Billboard Latin Music Awards. "Despacito" became Fonsi's biggest success, winning four Latin Grammy Awards, seven Billboard Latin Music Awards, five Billboard Music Awards and three Grammy Awards nominations. He also won one Latin American Music Award for "Échame la Culpa" with Demi Lovato.

As of 2018, Fonsi has broken six Guinness World Records and sold more than 11 million records with "Despacito", whose music video was the most-watched YouTube video of all time until November 2020, with over 8 billion views.