Exhorder is an American heavy metal band from New Orleans, Louisiana. They are considered progenitors of the groove-oriented thrash sound later made famous by bands such as Pantera and Machine Head, and their music has been regarded as a large influence on the New Orleans metal scene. Initially active from 1985 to 1994 and reformed from 2008 to 2011, Exhorder has since reformed in 2017. To date, the band has released four studio albums: Slaughter in the Vatican (1990), The Law (1992), Mourn the Southern Skies (2019) and Defectum Omnium (2024).