Fanny Lucía Martínez Buenaventura (born February 8, 1973), better known professionally as Fanny Lu, is a Colombian singer, songwriter and actress from Santiago de Cali, Colombia. She studied at the University of the Andes and received a degree in industrial engineering. She is the mother of two children, Mateo and Valentina, and is currently divorced. She signed with Universal Music Latin record label.

Her first job in the entertainment industry was in Colombia, as hostess to a music magazine called Siempre Música. She then moved on to radio voice in the principal radio stations from her country. However, she wasn't recognized until 1998, when she made part of the cast from the Colombian soap opera Perro Amor.

In 2006 she released Lágrimas Cálidas, winning fame in Colombia and some countries from Latin America, with her two singles that reached the top on the Latin charts. Her 2008 album Dos consolidated her musician career, giving credibility as a famous artist. Her single "Tú No Eres Para Mi" was number one in several countries. She released her third album, Felicidad y Perpetua on November 2011. Her humanitarian work granted her to be named "Goodwill Ambassador" from the FAO.