The Oath of Black Blood is a compilation album by the Finnishblack metal band Beherit. The album is not a separate recording, but a compilation of the band's demo Demonomancy and EPDawn of Satan's Millennium. The material was recorded in late 1990 and released as an album in 1991 through Turbo Music, without Beherit's permission, after the band spent the recording budget on alcohol. Spikefarm Records re-released the album in 2005 in digipak format with different artwork.