Juan Fernando Kubero Diaz (Nogoyá, November 7, 1949) is an Argentine rock guitarist, best known for being the founder and leader of the rock group The Brotherhood of the Solar Flower, and for integrating the group's Rock and Heavy roll and Grandparents of Nothingness. Argentina's edition of Rolling Stone magazine ranked at No. 13 on its list of the 100 greatest guitarists in the history of Argentine rock.