John Bush is an American heavy metal singer. He came to prominence in the 1980s as the lead singer and lyricist of Armored Saint, a heavy metal band from Los Angeles, California. In 1992, he joined thrash metal band Anthrax, with whom he remained until 2005 and briefly rejoined in 2009–2010. Bush has also been active with the reformed Armored Saint intermittently from 1999 to the present, and involved with other projects such as Metal Allegiance and Category 7.

Armored Saint is an American heavy metal band formed in Los Angeles, California in 1982. Since 1990, the band has consisted of John Bush on lead vocals, Joey Vera on bass, Jeff Duncan on guitar and the Sandoval brothers on drums and guitar, respectively. Of the current lineup, Bush and Vera are the two constant members. To date, the band has released eight studio albums, one EP, two live albums and one compilation album.