Fen is a British black metal/post-rock band formed in 2006 from the Fens of East Anglia signed to the label Code666. Their Myspace page reports that they "draw the listener into a windswept and desolate landscape, bereft of hope". In 2006 they recorded the Ancient Sorrow EP (released on both CD and vinyl) and January 2009 saw the release of the first full length album The Malediction Fields under the CODE666 record label. In 2011 they released the second studio album Epoch (also CODE666 records), gaining positive reviews in leading magazines Metal Hammer (8/10) and Terrorizer magazine (7.5/10). The album was launched at the Bull & Gate venue in London with support from the old Corpse Road on 11 February 2011.

Fen have played at many festivals and with many other acts, including at the Infernal Damnation Festival, the Damnation Festival 2010 (alongside acts such as Sabbat and Lawnmower Deth) the Aurora Infernalis Festival in 2012 (alongside Primordial) and tours (including international dates) with Negura Bunget, Wodensthrone and Agalloch.