"Knee Deep in the Blues" is a song written by Melvin Endsley and recorded by American country music artist Marty Robbins. It was released on December 17, 1956, as the lead single from his compilation album Marty's Greatest Hits. The song reached number three on the Country Singles charts.
Guy Mitchell released a cover version of the song the same year that reached number 16 on the Billboard Hot 100. In the UK, it reached number three on the UK singles chart.