At San Quentin is the 31st overall album by Johnny Cash, and a recording of a live concert given to the inmates of San Quentin State Prison. The concert was filmed by Granada Television, produced and directed by Michael Darlow. The album was a follow-up to Cash's previous live album, the critically acclaimed and commercially successful At Folsom Prison.
The album was certified gold on August 12, 1969, platinum and double platinum on November 21, 1986, and triple platinum on March 27, 2003 by the RIAA. The album was nominated for a number of Grammy Awards, including Album of the Year and won Best Male Country Vocal Performance for "A Boy Named Sue."