Killbox 13 is the 12th studio album by thrash metal band Overkill, released in 2003.

It is the first album with rhythm guitarist Derek Tailer.

The name stems from the fact that the band considers this to be their thirteenth release because they include the Overkill EP as their first, or that they had released the covers album Coverkill, which would have been their eleventh studio album.

There was an EP called Overkill back in '84...", said Bobby Ellsworth.

[citation needed] Killbox 13 received much critical acclaim because some of the songs marked a return to the raw unpolished thrash style exhibited on the first album Feel The Fire, which Overkill had gradually moved away from afterwards.