Cesar J. Rosas (born September 26, 1954, in Hermosillo, Mexico) is a Mexican singer, songwriter and guitarist for Los Lobos.

Rosas also participates in the Latin supergroup Los Super Seven.

Aside from live shows with Los Lobos, Cesar Rosas has been active as a session musician and sideman during the past several decades.

Her half-brother, Gabriel Gómez, was tried, convicted of her murder, and sentenced to life in prison without the possibility of parole.

Sandra Rosas' body was found on November 22, 2000, in Santa Clarita, CA.