"Run Silent" (also known as "Run Silent, Run Deep") is a song by British-based pop act Shakespears Sister, released as the fourth single from their debut studio album Sacred Heart by FFRR Records. The single mix features Marcella Detroit more prominently than on the album version. The single failed to reach the success of "You're History", peaking at number 54 on the UK Singles Chart, and number 47 in Australia.