Leonardo "Flaco" Jiménez (born March 11, 1939) is an American singer, songwriter and accordionist from San Antonio, Texas. He is known for playing Norteño, Tex Mex and Tejano music. Jiménez has been a solo performer and session musician, as well as a member of the Texas Tornados and Los Super Seven.
Over the course of his seven-decade career, he has received numerous awards and honors, including Lifetime Achievement Awards from the Grammys, Americana Music Awards, Tejano Music Awards, and Billboard magazine.