Opus Nocturne is the third studio album by Swedish black metal band Marduk. It was recorded and mixed at Hellspawn Studios in September 1994 and released that December by Osmose Productions. It was re-released in digipak format that included bonus rehearsal tracks on June 27, 2006. Opus Nocturne is the last Marduk album to feature Joakim Göthberg on vocals and Dan Swanö as mixer. Opus Nocturne was the first album to showcase Marduk's signature hyper-speed blast beat tempo, however it still contained much of the melody from Those of the Unlight while retaining this break-neck speed, instead of sheer brutality on albums like Heaven Shall Burn... When We Are Gathered and Nightwing.