Diocletian is a New Zealand extreme metal band from Auckland.
The band, formed in 2004, split up in 2015.
Their cast then consisted of Brendan Southwell (aka Atrociter and BS)
(guitar, vocals), L. Muir (guitar, vocals, bass), C. Sinclair (drums) and J. Baldwin (guitars).
The band's 2015 album Gesundrian was listed as number 15 on Pitchfork's list of the "Best Metal Albums of 2014".